Question

factorise = 15-2a-a^2

Answer 1

Answer:

by side changing

a^2+2a-15 =0

a^2 +5a-2a-15=0

a(a+5) -2(a+5). =0

(a+5). (a-2) =0

Answer 2

Answer:

$15 - 2a - {a}^{2}$

$- {a}^{2} - 2a + 15$

$p + q - 2$

$pq = - 15 = - 15$

$1,15 \\ 3,5$

$( - a^{2} + 3a)( - 5a + 15)$

$a( - a + 3) + 5( - a - 3)$

$( - a + 3)(a + 5)$