Question

Hey can someone tell me how to factorise this: a^2+5a-36 ...... Please like always, I forgot again

Answer 1

Answer:

x = -9, or x = 4

Step-by-step explanation:

a^2+5a-36

a^2 + 9a - 4a - 36

a x (a+9) - 4a - 36

a x (a+9) - 4 (a+9)

=

(a+9) x (a-4)

x = -9, or x = 4

Answer 2

find two numbers whose multiplication must be equal to -36 and when addition or subtraction must be equal to 5.

so, the two numbers are 9 and - 4

9 × - 4 = -36

9 - 4 = 5

a² + 5a - 36

a² + 9a - 4a - 36

a ( a + 9) -4 ( a + 9)

(a + 9) ( a - 4)

a = -9 , 4