Question

若x的平方加x加1等于负4求括号2减x乘括号3加x的值

Answer 1

x^2 +x+1=-4

(2-x)(3+x)

=6+2x-3x-x^2

=-x^2-x+6

=-(x^2+x)+6

=-(x^2+x+1)+7

=-(-4)+7

=4+7

=11