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(20+2x)(30+2x)=4x^2+100x+600
We move all terms to the left:
(20+2x)(30+2x)-(4x^2+100x+600)=0
We add all the numbers together, and all the variables
(2x+20)(2x+30)-(4x^2+100x+600)=0
We get rid of parentheses
-4x^2+(2x+20)(2x+30)-100x-600=0
We multiply parentheses ..
-4x^2+(+4x^2+60x+40x+600)-100x-600=0
We get rid of parentheses
-4x^2+4x^2+60x+40x-100x+600-600=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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