Question

scoateti factoru de sub radical plzz urgent

Answer 1

a < 2 |·(-1) ⇒ -a > -2 |+2 ⇒ 2 - a > 0 ⇒ |2 - a| = 2 - a

$\it \sqrt{7(2-a)^2} = \sqrt7 \sqrt{(2-a)^2} = \sqrt7 |2-a|= \sqrt7(2-a)$