Question

expression of polynomial X square + 7 x + 12​

Answer 1

${x}^{2} + 7x + 12 \\ = {x}^{2} + (4 + 3)x + 12 \\ = {x}^{2} + 4x + 3x + 12 \\ = x(x + 4) + 3(x + 4) \\ = (x + 3)(x + 4)$

Answer 2

x^2+7x+12=0

x^2+3x+4x+12=0

x(x+3)+4(x+3)=0

(x+3)(x+4)=0

x=-3 or

x=-4