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15h^2+20h-35=0
a = 15; b = 20; c = -35;
Δ = b2-4ac
Δ = 202-4·15·(-35)
Δ = 2500
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{2500}=50$$h_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(20)-50}{2*15}=\frac{-70}{30} =-2+1/3 $$h_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(20)+50}{2*15}=\frac{30}{30} =1 $
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