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(d+7)(d+4)=-2
We move all terms to the left:
(d+7)(d+4)-(-2)=0
We add all the numbers together, and all the variables
(d+7)(d+4)+2=0
We multiply parentheses ..
(+d^2+4d+7d+28)+2=0
We get rid of parentheses
d^2+4d+7d+28+2=0
We add all the numbers together, and all the variables
d^2+11d+30=0
a = 1; b = 11; c = +30;
Δ = b2-4ac
Δ = 112-4·1·30
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1}=1$$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-1}{2*1}=\frac{-12}{2} =-6 $$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+1}{2*1}=\frac{-10}{2} =-5 $
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