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4y^2=7y
We move all terms to the left:
4y^2-(7y)=0
a = 4; b = -7; c = 0;
Δ = b2-4ac
Δ = -72-4·4·0
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{49}=7$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-7}{2*4}=\frac{0}{8} =0 $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+7}{2*4}=\frac{14}{8} =1+3/4 $
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