Question

Using identities, solve : 3 (a) (2x + 9) (2x - 7 )

Answer 1

Answer:

$(2x + 9)(2x - 7)$

$\sf \red{2 \times (2x - 7) + 9 \times (2x - 7)}$

$\sf \red{4 {x}^{2} - 14x + 18x - 63 }$

$\sf \boxed{ \green{ \therefore \: 4 {x}^{2} + 4x - 63 }}$