Question

quadratic trinomial into factor.
solve these questions please......

Answer 1

here are the answers (solved). .

Answer 2

$1) \: {(2a - b)}^{2} + 2(2a - b) - 8$
=>
$x = (2a - b) . \: {x}^{2} - 2x - 8$
=>
${x}^{2} - 4x + 2x - 8 = x(x - 4) +$
$2(x - 4)$

=>
$(x + 2)(x - 4)$
=>
$(2a - b + 2)(2a - b - 4)$
$2) \: 9 {x}^{4} - 12 {x}^{3}y + 21 {x}^{2} {y}^{2}$

=>
$3{x}^{2} (3 {x}^{2} - 7xy + 4 {y}^{2})$
=>
$3 {x}^{2}(3 {x}^{2} - 3xy - 4xy + 4 {y}^{2} )$

=>
$3 {x}^{2}(3x(x - y) - 4y(x - y))$
=>
$3 {x}^{2} (3x - 4y)(x - y)$