Question

factorise 16-9a^2 what is the answer​

Answer 1

SOLUTION :

$16 - 9 {a}^{2} \\ \\ = (4) {}^{2} - (3a) {}^{2} \\ \\ it \: is \: in \: the \: form \: of \: a {}^{2} - b {}^{2} = (a + b)(a - b) \\ \\ = (4 + 3a)(4 - 3a)$

Answer 2

16-9a^2

=(4)^2-(3a)^2

=(4+3a)(4-3a)

by using a²-b² = (a+b)(a-b)