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Factor the expression 10x2 + 20x - 80

 Aug 25, 2018
 #1
avatar+100519 
+2

10x^2  + 20x  - 80   take out the  greatest common factor, 10

 

10  (x^2  + 2x  - 8)

 

To factor the polynomial, we need two numbers that add to 2  and multiply to  -8.....

4  and -2    seem to be  just right....so we have

 

10 ( x + 4) ( x - 2)

 

 

cool cool cool

 Aug 25, 2018
edited by CPhill  Aug 25, 2018
 #2
avatar+96 
+1

I'm a bit confused, would I expand the two polynomials then multiply the answer all by 10?

 Aug 25, 2018
 #3
avatar+96 
+1

Nevermind, I understand now

Olpers  Aug 25, 2018

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