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x(x+x)=63
We move all terms to the left:
x(x+x)-(63)=0
We add all the numbers together, and all the variables
x(+2x)-63=0
We multiply parentheses
2x^2-63=0
a = 2; b = 0; c = -63;
Δ = b2-4ac
Δ = 02-4·2·(-63)
Δ = 504
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{504}=\sqrt{36*14}=\sqrt{36}*\sqrt{14}=6\sqrt{14}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-6\sqrt{14}}{2*2}=\frac{0-6\sqrt{14}}{4} =-\frac{6\sqrt{14}}{4} =-\frac{3\sqrt{14}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+6\sqrt{14}}{2*2}=\frac{0+6\sqrt{14}}{4} =\frac{6\sqrt{14}}{4} =\frac{3\sqrt{14}}{2} $
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