Question

Solve using the identity (x + a) (x + b) = x² + (a + b) x + ab :

(abc - 3) (abc - 4)

Answer 1

Step-by-step explanation:

(abc)²+(-3-4)abc+[(-3)(-4)]

So final answer is

a²+b²+c²+2ab+2bc+2ca+12abc+12

Answer 2

Answer:

$(abc - 3)(abc - 4) \\ = (abc) {}^{2} + ( - 3 + ( - 4))abc + ( - 3)( - 4) \\ = a {}^{2} b {}^{2} c {}^{2} - 7 abc + 12$