Mathematics
Junior High
Resolved
解き方これであってますかー?(因数分解です)
(x+1)(x-2)-4(-x+2)
=(x+1)(x-2)+4(x-2)
=(x+1) A + 4 A
= (x+1)(x-2)+4(x-2)
= x²-x-2 +4x-8
= x²+3x
-10
=(x+5) (x-2)
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