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75f^2-12=0
a = 75; b = 0; c = -12;
Δ = b2-4ac
Δ = 02-4·75·(-12)
Δ = 3600
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$f_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$f_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{3600}=60$$f_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-60}{2*75}=\frac{-60}{150} =-2/5 $$f_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+60}{2*75}=\frac{60}{150} =2/5 $
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