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Verified Answer :

HomertheGenius

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.

carlosego

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:

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


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