bjr
A = 3 (x + 2)
= 3*x + 3*2 = 3x + 6
B = (x + 2) (4x - 6)
= x*4x + x*(-6) + 2*4x + 2*(-6)
= 4x² - 6x + 8x - 12
= 4x² + 2x - 12
C = 3 (x + 2) + (x + 2) (x + 4)
= A + B
= 3x + 6 + 4x² + 2x - 12
= 4x² + 5x - 6
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bjr
A = 3 (x + 2)
= 3*x + 3*2 = 3x + 6
B = (x + 2) (4x - 6)
= x*4x + x*(-6) + 2*4x + 2*(-6)
= 4x² - 6x + 8x - 12
= 4x² + 2x - 12
C = 3 (x + 2) + (x + 2) (x + 4)
= A + B
= 3x + 6 + 4x² + 2x - 12
= 4x² + 5x - 6