Question

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Answer 1

16x²-24x+9

I'd used is
(a-b)²=a²-2ab+b²

= (4x)²- 2*4x*3 +(3)²
= (4x-3)²
or
= (4x-3) (4x-3)

Answer 2

$hey \: mate \: here \: is \: your \: answer$
$16x {}^{2} - 24x + 9$
$16x {}^{2} - (12 + 12)x + 9$
$16x {}^{2} - 12x - 12x + 9$
$4x(4x - 3) - 3(4x - 3)$
$(4x - 3)(4x - 3)$