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X2+X2=144
We move all terms to the left:
X2+X2-(144)=0
We add all the numbers together, and all the variables
2X^2-144=0
a = 2; b = 0; c = -144;
Δ = b2-4ac
Δ = 02-4·2·(-144)
Δ = 1152
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1152}=\sqrt{576*2}=\sqrt{576}*\sqrt{2}=24\sqrt{2}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-24\sqrt{2}}{2*2}=\frac{0-24\sqrt{2}}{4} =-\frac{24\sqrt{2}}{4} =-6\sqrt{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+24\sqrt{2}}{2*2}=\frac{0+24\sqrt{2}}{4} =\frac{24\sqrt{2}}{4} =6\sqrt{2} $
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