Question

$25x {}^{2} - (2x + 3) {}^{2} \: give \: me \: the \: answer$

Answer 1

$25x { }^{2} - 4x {}^{2} - 9 + 12x \: \\ by \: using \: identity \: opening \: th \: brackets \: \\ \\ 7x {}^{2} + 7x - 3x - 3 \\ \\ (7x - 3)(x + 1)$
(a
$(a + b) {}^{2} = a { }^{2} + b {}^{2} + 2ab$