Question

已知a+b=-4,ab=2,求2a²b+4ab²-4b+10的值

Answer 1

2a²b+4ab²-4b+10

=2ab(a+2b)-4b+10(ab=2代人)

=4(a+2b)-4b+10

=4a+8b-4b+10

=4a+4b+10

=4(a+b)+10（a+b=-4代人）

=-16+10

=-6