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7+3x=5x^2-2
We move all terms to the left:
7+3x-(5x^2-2)=0
We get rid of parentheses
-5x^2+3x+2+7=0
We add all the numbers together, and all the variables
-5x^2+3x+9=0
a = -5; b = 3; c = +9;
Δ = b2-4ac
Δ = 32-4·(-5)·9
Δ = 189
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{189}=\sqrt{9*21}=\sqrt{9}*\sqrt{21}=3\sqrt{21}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3\sqrt{21}}{2*-5}=\frac{-3-3\sqrt{21}}{-10} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3\sqrt{21}}{2*-5}=\frac{-3+3\sqrt{21}}{-10} $
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