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169x^2-121=0
a = 169; b = 0; c = -121;
Δ = b2-4ac
Δ = 02-4·169·(-121)
Δ = 81796
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{81796}=286$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-286}{2*169}=\frac{-286}{338} =-11/13 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+286}{2*169}=\frac{286}{338} =11/13 $
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