Question

分解因式1/2x的四次方-81/2x的四次方-8x的四次方+7x的平方-8

Answer 1

1/2x的四次方-8

=1/2(x^4-16)

=1/2(x^2+4)(x^2-4)

=1/2(x^2+4)(x+2)(x-2)

x的四次方+7x的平方-8

=(x^2+8)(x^2-1)

=(x^2+8)(x+1)(x-1)