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-8a^2+56a=0
a = -8; b = 56; c = 0;
Δ = b2-4ac
Δ = 562-4·(-8)·0
Δ = 3136
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{3136}=56$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(56)-56}{2*-8}=\frac{-112}{-16} =+7 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(56)+56}{2*-8}=\frac{0}{-16} =0 $
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