Question

急！几道因式分解的题目！帮我解一下

16-（2a+36）^2
-36x^2+12xy-y^2
4x(a-b)-8y(b-a)
（x^2-5）^2+8(x^2-5)+16
还有两道计算题
2x^2y×（-8y^2）+4x^y×5y^2
2（x+5）(x-4)-3(X-6）（X+1）
给我一些步骤

Answer 1

16-（2a+36）^2=(4-2a-36)(4+2a+36)
=(-2a-32)(2a+40)=-4(a+16)(a+20)

-36x^2+12xy-y^2=(-6x+y)(6x-y)

4x(a-b)-8y(b-a)=4(a-b)(x+2y)

（x^2-5）^2+8(x^2-5)+16
=(x^2-1)^2
还有两道计算题
2x^2y×（-8y^2）+4x^y×5y^2
=(20x^y-16x^2y)y^2
=4y^2x^y(5-4x^y)
2（x+5）(x-4)-3(X-6）（X+1）
=2(x^2+x-20)-3(x^2-5x-6)
=-x^2+17x-22???????

Answer 2

=(4+2a+36)(4-2a-36)=(2a+40)(-2a-32)=-4(a+20)(a+16)

=-(6x-y)^2

=(a-b)(4x+8y)=4(a-b)(x+2y)

=(x^2-5+4)^2=[(x-1)(x-4)]^2