Question

Factor completely and then place the factors in the proper location on the grid. a2 - a - 20

Answer 1

For this case we have the following polynomial:

$a ^ 2 - a - 20$

We must factor the polynomial.

To do this we look for two numbers that are added equal to -1 and multiplied equal to -20.

Factoring we have:

$a ^ 2 - a - 20 = (a-5) (a + 4)$

Answer:

The factored expression is given by:

$a ^ 2 - a - 20 = (a-5) (a + 4)$

Answer 2

A² - a - 20 = 
= a² - 5 a + 4 a - 20 =
= a ( a - 5 ) + 4 ( a - 5 ) = 
= ( a - 5 ) ( a + 4 ) 
The zeroes are: a = -4, a = 5.