Question

(7a²-63b²) =?
answer fast​

Answer 1

Answer:

7(a²-9b²)

7(a-9b) (a+9b)

Answer 2

SOLUTION

CORRECT QUESTION

TO DETERMINE

To factorise

$\sf 7 {a}^{2} - 63 {b}^{2}$

EVALUATION

Here the given expression is

$\sf 7 {a}^{2} - 63 {b}^{2}$

We factorise it as below

$\sf 7 {a}^{2} - 63 {b}^{2}$

$\sf = 7 ({a}^{2} - 9 {b}^{2} )$

$\sf = 7 \{{(a)}^{2} - {(3b)}^{2} \}$

$\sf = 7 (a + 3b)(a - 3b)$

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