Mathematics
Senior High
Solved
解説お願いします。
答え教えてください。
17 練23
(1) x² + y² = 25, y=xtl
↑x+y^2=25-①
No.
Date
y=x+1
②を①に代入
X² + ( x + 1)² = 25
x+x+2x+1-25=0
2x²+2x-24=0
2(x - 3)(x + 4) = 0
2X
2-24才
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