Question

Identify the factors of x2 - 8x - 20.

(x + 4)(x - 5)
(x + 5)(x - 4)
(x - 10)(x + 2)
(x - 2)(x + 10)

Answer 1

4+ ways to factor quadratic equation
leading coefficient is one so easy way to factor out is by using *AC method or headphone method whatever you wanna call it :D
so find two number if you multiply them you should get product of AC and if you add or subtract them you should get middle term

Answer 2

what?

Answer 3

ac and middle terms are \[\huge\rm Ax^2+Bx+C=0\]
where
a= leading coefficient
b=middle term
c=constant term

Answer 4

so in this equation x^2-8x-20
a=1
c=-20
b=-8
so find two number if you mtuliply them you should get -20 and if you add or subtract them you should get -8

Answer 5

multiply**

Answer 6

10 and 2???

Answer 7

one of them should be negative bec when you multiply them you should get -20

Answer 8

oh i mean -10 and 2

Answer 9

yep right !

Answer 10

so answer is ?

Answer 11

c?

Answer 12

yep

Answer 13

yay!!!

Answer 14

YAY! :=)