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64x^2-121=0
a = 64; b = 0; c = -121;
Δ = b2-4ac
Δ = 02-4·64·(-121)
Δ = 30976
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{30976}=176$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-176}{2*64}=\frac{-176}{128} =-1+3/8 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+176}{2*64}=\frac{176}{128} =1+3/8 $
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