Question

Factor: a2 – a – 20

Answer 1

(a+4)(a-5)

Answer 2

Will you show your steps?

Answer 3

You need to find 2 numbers that will add up to -1 and multiply to give you -20.
The factors of 20 are: 1, 20; 2, 10; and 4, 5.
Playing around with the numbers (making one OR both of the numbers negative) you will see that 4 and 5 are your only option.

4 x -5 = -20 AND 4 + -5 = -1. That's the best way I can explain Hope this helps.

Answer 4

a2+(x+y)a +xy
this a formula for this question

Answer 5

(a+x)(a+y) is the ans for that

Answer 6

Thank you very much @mbernard91 and @mahdi2020 Your wrong.