Question

ok

Answer 1

this is a quadratic so convert it so there s 0 on right hand side:

x^2 + x - 20 = 0

now you can factor this to the form (x + a)(x - b) = 0

Answer 2

no ab must equal -20 and a + b must equal +1 (because we +x in the middle ie +1x)

Answer 3

get it?

Answer 4

think of some factors of -20

theres -5 * 4
or 5 * -4
or 2 * -10
or -2 * 10 for example

which one adds up to +1?

Answer 5

-2 + 10 = +8 ? - nope that's no good

Answer 6

can you see the correct one?

Answer 7

is it the first one -5 and 4?

Answer 8

right so the factors are

(x + 5)(x - 4) and this = 0

Answer 9

now when to thing are multiplied together and they = 0 then either one is 0 or the other is
so x+5 = 0 or x - 4 = 0

solve these 2 equations and you have your solution set

Answer 10

* two things