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(3x+15)(3x+15)=8x
We move all terms to the left:
(3x+15)(3x+15)-(8x)=0
We add all the numbers together, and all the variables
-8x+(3x+15)(3x+15)=0
We multiply parentheses ..
(+9x^2+45x+45x+225)-8x=0
We get rid of parentheses
9x^2+45x+45x-8x+225=0
We add all the numbers together, and all the variables
9x^2+82x+225=0
a = 9; b = 82; c = +225;
Δ = b2-4ac
Δ = 822-4·9·225
Δ = -1376
Delta is less than zero, so there is no solution for the equation
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