Question

Factorise 12³− 15²− 7a by regrouping the terms

Answer 1

Step-by-step explanation:

1.1 15 = 3•5

(15)2 = (3•5)2 = 32 • 52

Equation at the end of step

1

:

(12sq - (32•52)) - 7a

STEP

2

:

Final result :

12sq - 7a - 225