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5x^2-15=335
We move all terms to the left:
5x^2-15-(335)=0
We add all the numbers together, and all the variables
5x^2-350=0
a = 5; b = 0; c = -350;
Δ = b2-4ac
Δ = 02-4·5·(-350)
Δ = 7000
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{7000}=\sqrt{100*70}=\sqrt{100}*\sqrt{70}=10\sqrt{70}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-10\sqrt{70}}{2*5}=\frac{0-10\sqrt{70}}{10} =-\frac{10\sqrt{70}}{10} =-\sqrt{70} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+10\sqrt{70}}{2*5}=\frac{0+10\sqrt{70}}{10} =\frac{10\sqrt{70}}{10} =\sqrt{70} $
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