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Mathematics Senior High

青チャート数1のEX78の問題です。(2)の解答の3行目からが理解出来ません。詳しく説明していただけると幸いです。

EX 2次関数y=ax²+bx+cのグラフをCとする。 C をx軸方向に3,y 軸方向に5だけ平行移動 REG ③78 2307-110 したグラフをCとする。 C を表す2次関数がy=ax²+ (2a+2)x-3a+1であるとき (1) 6,c をaで表せ。 [京都学園大] 豊線(2)がx軸から切り取る線分の長さが y=ax²+bx+cは2次関数であるから a=0(8) - JUNONE (1)Cをx軸方向に3,y 軸方向に5だけ平行移動したグラフの y=f(x)のグラフをx 軸方向に p,y 軸方向に 式は say-5=a(x-3)²+b(x−3)+c gだけ平行移動したグラ すなわち y=ax²+(b-6a)x+9a-36+c+5 の式は このグラフが C と一致するから, 係数を比較して y-q=f(x-p) b-6a=2a+2,9a-36+c+5=-3a+1 よって b=8a+2, c=-12a+36-4=-12a+3(8a+2)-4=12a+2 (2) ax²+2(a+1)x-3a+1=0の判別式をDとすると D=(a+1)²-a(−3a+1)=4a²+a+1 2 = 4( a + ¹² ) ² + EX ②70 (*) よって, D>0は常に成り立つから, C'はx軸と異なる2点で 交わり, そのx座標は ax2+2(a+1)x-3a+1=0を解いて x= 15 _______−(a+1) ± √√4a²+a+1¹ 16 a E+ ゆえに,放物線 C' がx軸から切り取る線分の長さは a 19であるとき,αの値を求めよ。 2√4a²+a+1 |a| -(a+1)+√4a²+a+1___(a+1)-√4a²+a+1 よって, 条件から ゆえに 4(4a²+a+1)=19α² ゆえに (a−2)(3a+2)=0 2√4a²+a+1 lal 0&Aca == √19 よって よって (1) 放物線y=-x2+2(k+1)x-k²が直鎖 を求め 3a²-4a-4=0 a=2, 2 3 ←C' がx軸と異なる2 点で交わることを確認し ている。左 x-(a+1) ± √ X3 D ac 根号内は, (*) と同じ計 算になる。 OSIS ←絶対値をつけて表す。 X3 ←両辺を平方して、分母 を払う。なおc=d

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Mathematics Senior High

(3)について詳しく教えてください。お願いします。

(注) この科目には、 選択問題があります。 第1問 (必答問題) (配点30) [1] 関数 について考える。 (1) (4) f(x)=2sin 2x-√2 cos(x+4) TU 2-52.0 ア である。 である。 (2) 0≦xの範囲におけるf(x) の最大値を求めよう。 加法定理と2倍角の公式より cos(x+4)= di cas スン イ ウィ R ① sin2x= I2 sinx cos x 2.zaina cosa -√2. = (5x –je). である。よって, t = cosx-sinx とおくと、f(x)は4qincoil -ラージウス) f(x)=オカt-t+キ -55x+cosic √ris (1732) 元 7-91326. 504 4. cos —(cosx−sinx) となる。ここで,0≦x≦πであるから,①よりのとり得る値の範囲は 4 ク ケンsts ~21²²-² +2 レオ 2 である。したがって, 0≦x≦xの範囲におけるf(x) の最大値は サシ 2 (1^²) * オ -21²-11² (4-1) * ²-1-29141²5 +²= 1 = -25₁11054 (数学ⅡⅠ・数学B 第1問は次ページに続く。) (3)の範囲において, f(x)=1を満たすxの値は π t である。 ただし,αは 0<a< を満たす角である。 O α, N ⑩ の解答群 -4 -1-√7 4 π セ π かつ sina= 0-1/32 ② 42-47.. 1²-24² - 4+2 = 1 Gislut & x) = | 1 + ) {3^+^)~* 1=-1₁ 2054-931 (=-1₁& -1+√7 4 オンブル 21 -√2 R {[(x + 7 + 1 = みに ZnG erfarin. mze-ze, ze 1 ソ 1 6 4 1-√7 (3 第1回 1 3 1+√7 4 (数学ⅡI・数学B 第1問は次ページに続く。)

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English Senior High

解答とその解答の簡単な解説をしていただきたいです。 全ての問題でなくても全く構いません。

1. Our boss was 100 AD (A) so (B) enough 3. It was kind --- (A) in ------- 2. The employee was not (A) enough haqmos engaged with work to notice other employees coming in. OSTUN (D) very (B) for ma experienced... (B) so (C) too (D) order 4. It has never been easy same time. erli (A) of 9. In order (C) too the manager to give everyone at the company a thank-you gift. (C) with (D) of (B) tonale(C) for 178 5. Successful applicants are ieri peal oel (A) need (B) required 6. I had a clear idea of -- (A) what to do (nedmond! to handle the situation. anyone to manage a large number of tasks at the [S] (D) in ------- to have a master's degree in finance. 10 beysien (C) suppose (D) enough LORE (A) for our product to sell (B) our product to sell (B) how to do (a)(C) when to do TEL/ 7. Employees should have the ability to figure out - (A) what to (B) how to (C) as to after I had been chosen as manager. 8. The sales department has announced a plan (A) to (B) with (C) of (D) on 10. Mr. Davis was very fortunate - (A) to choose (B) to be choosing ------- (D) where to do vaz handle the pressure. (D) enough to well, we need to have a sales expert on staff. - hire several new staff members. (C) for our product selling (D) for our product sale S as a sales representative for the company. (C) to have been chosen (D) for him to choose

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English Senior High

コミニケーション英語2 Lesson7 Section1 下のQuestion Anser Practiceの解説が知りたいです!

Communication English II Lesson 7 Encouraging Song Section 1&2 Reading Passage Section 1 There are many songs that help people overcome sadness or troubles. Makenaide may be one of them. This song has been encouraging many people for a long time. The lyrics of Makenaide were written by Sakai Izumi, the vocalist of ZARD. It became a hit in 1993. The following year, it was adopted as the theme song for the National High School Baseball Invitational Tournament. Some schools have also been using this song for graduation ceremonies. When the Great Hanshin-Awaji Earthquake occurred in 1995, this song was often aired. Many people were able to recover their spirits by listening to it. The song also cheered people up after the Great East Japan Earthquake in 2011. Unfortunately, Sakai passed away in 2007. However, this song is still popular today. Section 2 What makes this song so attractive? The answer may be in its lyrics. The song has a message of hope for everyone. Let's take a look at the first refrain. Sakai left a piece of paper on which she wrote the lyrics. It shows that she changed a part of them. She replaced the words "Don't stop until the end" with "Keep on running until the end". She may have thought that this sounded more positive. Handout Reading No.15 Text p.94-97 She changed this part while she was actually recording the song. "Which words communicate better?" was the question she always had in her mind. She always searched for words that would encourage people. Don't give up! Just a little farther 負けないで もうすこし Keep on running until the end 最後まで走りぬけて Even though we may be apart どんなに離れてても I'll stand by you with all my heart 心はそばにいるわ Follow the dream you'll catch in the end 追いかけてはるかな夢を 1. Question-Answering Practice Section 1 1. Who wrote the lyrics of Makenaide? The lyrics of Makeneide were written 2. What have some schools been using Makenaide for Sakai Izumi 3. Is Makenaide still popular today? song is still popular today. Section 2 1. What did Sakai leave? 2. Which words did she choose, "Don't stop" or "Keep on running"? She 3. What question did she always have in her mind?

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