Question

using suitable identity, evaluate the following (5a-7)(5a-7)​

Answer 1

Answer:

(5a - 7)(5a - 7) = 25a² – 70a + 49

[using the formula:

(a - b)² = a² - 3ab + b²]

Step-by-step explanation:

$(5a - 7)(5a - 7) \\ = {(5a - 7)}^{2} \\ = {(5a)}^{2} - 2(5a)7 + {(7)}^{2} \\ = 25 {a}^{2} - 70a + 49$