Question

Factorise : (64m 2 - 144mn + 81n 2 )- 25p 2

Answer 1

(64m²-144mn+81n²)-25p²=[(8m)²-2×8m×9n+(9n)²]-(5p)²
                                        =[(8m-9n)²]-(5p)²
                                        =[(8m-9n)+5p][(8m-9n)-5p]       [∵a²-b²=(a+b)(a-b)]
                                        =(8m-9n+5p)(8m+9n-5p)

Answer 2

Answer:

(8m2 -2x8mx9n +9n2 )-5p2

8m+9n-5p 2

(8m- 9n- 5p)(8m- 9n+5p)=ans