Question

m^2+2m-n^2+1a(a-8)+168+15xy-12x-10y三道都是因式分解还有一道：多项式2x^2+bx+除

Answer 1

1.m^2+2m+1-n^2

=(m-1)^2 -n^2

=(m-1-n)(m-1+n)

2.(a-4)^2

3.15xy-12x-10y+8

=3x(5y-4)-2(5y-4)

=(3x-2)(5y-4)

2x^2+bx+c=(2x+4)(x-4)

bx+c=-4x-16

b=-4,c=-16

b^2+c=0