Mathematics
Junior High
Resolved
二次方程式です
解いてみたんですが、合ってますか??
(9) x²-6=4x
X²-42= 6
L-4x+4=6+4
(X-2) ² = 10
X-2 = INTO
x = 21√10
(10) r?+5r=2(r+2)
2(2+52 = 2x+4
x2+5x-22-4=0
22+3x+4=0
(x - 1)(x + 4) = 0
1(= 1₁ -4
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