Question

Which of the binomials below is a factor of this trinomial?

x2 - 5x - 36

A. x + 4
B. x - 4
C. x2 + 7
D. x - 7

Answer 1

try and factor the trinomial
you need 2 numbers whose product is -36 and whose sum is -5

Answer 2

what are the factors of -36 which will give -5 when added?

Answer 3

Hint:- one is -9

Answer 4

im confessed

Answer 5

-36 = -9 * what?

Answer 6

or solve the equation
-9x = -36

Answer 7

these 2 numbers will then form the factors
(x + a)(x + b)

where a and b are the 2 number s:- a = -9 and b = the one you get when you solve the equation
-9x = -36

Answer 8

-9x = -36
divide both sides by -9
what is x ?

Answer 9

what is -36 divided by -9 ?