A=2x(x+3) C=(x+4)(x-6)+(1+x)(x-7)

A = 2x (x + 3)
A = 2x X x + 2x X 3
A = 2x² + 6x

C = (x + 4) (x - 6) + (1 + x) (x - 7)
C = [x X x + x X (- 6) + 4 X x + 4 X (- 6)] + [1 X x + 1 X (- 7) + x X x + x X (- 7)]
C = x² - 6x + 4x - 24 + x - 7 + x² - 7x
C = 2x² - 8x - 31

A=2x (x+3)
A=2x²+6x
C=(x+4)(x-6)+(1+x)(x-7)
C=x²-6x +4x -24+1x-7+x²-7x
C=2x²-13x+4x+1x-24-7
C=2x²-8-31
C=2x²-39