Question

Factorise the following by using (x-a)(x-b)=-to the power 2+(a+b)x-ab

Answer 1

Answer:

$1) {x}^{2} +14x + 45 = {x}^{2} + (9 + 4) x + 45$

$2) {x}^{2} - 22x + 120 = {x}^{2} - (12 + 10)x + 120$

$3) {y}^{2} + 5y - 36 = {y}^{2} + (9 - 4)y - 36$

$4) {a}^{2} + 3a - 88 = {a}^{2} + (11 - 8)a - 88$

Step-by-step explanation:

$5) {x}^{2} - 4x - 21 = {x}^{2} - (7 - 3) x - 21$