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8r^2+26r+15=0
a = 8; b = 26; c = +15;
Δ = b2-4ac
Δ = 262-4·8·15
Δ = 196
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{196}=14$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(26)-14}{2*8}=\frac{-40}{16} =-2+1/2 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(26)+14}{2*8}=\frac{-12}{16} =-3/4 $
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