Question

为使x的平方+ax-18与2x的平方+bx+24在整数范围内可以分解,a.b分别可以取那些数

Answer 1

x^2+ax-18

=(x-18)(x+1)(a=-17)

=(x-9)(x+2)(a=-7)

=(x-6)(x+3)(a=-3)

=(x-3)(x+6)(a=3)

=(x-1)(x+18)(a=17)

=(x-2)(x+9)(a=7)