y=2(x+1)(x-5)怎么化为y=2x²-8x-10
问题描述:
y=2(x+1)(x-5)怎么化为y=2x²-8x-10
答
y=2(x+1)(x-5)
y=2(x²-5x+x-5)
y=2(x²-4x-5)
y=2x²-8x-10