✨ Best Answer ✨
(1)
(a+b)²-4
=(a+b)²-2²
=(a+b+2)(a+b-2)
※x²-y²=(x+y)(x-y) を利用。
(2)
x=-2
|3x|+x+1
=|-6|-2+1
=6-2+1
=5
✨ Best Answer ✨
(1)
(a+b)²-4
=(a+b)²-2²
=(a+b+2)(a+b-2)
※x²-y²=(x+y)(x-y) を利用。
(2)
x=-2
|3x|+x+1
=|-6|-2+1
=6-2+1
=5
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