Question

x² + 7x + 12 = (-3)2 + 7 (-3)+12=9+4+12=23​

Answer 1

Answer:

GIven : x

2

+7x+12

=x

2

+4x+3x+12, (split middle term so that resultant is same)

=(x

2

+4x)+(3x+12), (group pair of terms)

=x(x+4)+3(x+4), (factor each binomials)

=(x+4)(x+3), (factor out common factor (x+4))