Question

factorise:- -7a2–10a + 8

Answer 1

Answer:

a= -2 or 4/7

Step-by-step explanation:

-7a²- 10a+8=0

Bringing all the terms to the other side,

7a²+10a-8=0

product= 7* -8= -56, sum=10, factors= -4,14

7a²+14a-4a-8=0

7a(a+2) - 4(a+2)=0

(a+2) (7a - 4) = 0

a+2= 0 =>a= -2

and,

7a - 4= 0 =>7a= 4=> a=4/7