Question

Use suitable indentity to get the product
(2b-7)(2b-7)
(7a-ab)(7a+9b)

Answer 1

Step-by-step explanation:

FOR FIRST ONE ,

APPLY

${(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab$

YOU WILL GET ,

${(2b - 7)}^{2} = 4 {b}^{2} + 49 - 28b$

FOR SECOND ONE ,

APPLY

$(a + b)(a - b) = {a}^{2} - {b}^{2}$

YOU WILL GET

$(7a - ab)(7a + ab) \\ = 49 {a}^{2} - {a}^{2} {b}^{2}$