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x(3x+7)=330^2
We move all terms to the left:
x(3x+7)-(330^2)=0
We add all the numbers together, and all the variables
x(3x+7)-108900=0
We multiply parentheses
3x^2+7x-108900=0
a = 3; b = 7; c = -108900;
Δ = b2-4ac
Δ = 72-4·3·(-108900)
Δ = 1306849
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-\sqrt{1306849}}{2*3}=\frac{-7-\sqrt{1306849}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{1306849}}{2*3}=\frac{-7+\sqrt{1306849}}{6} $
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