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Solve the quadratic by quadratic formula below

a^2-4a=21

 Apr 5, 2020
 #1
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7 and -3

 Apr 5, 2020
 #2
avatar+2197 
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We will factor this into:

 

(x+3)(x-7).

So, x=-3, and x=7.

 Apr 5, 2020

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