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2d-1=3/4d+9
We move all terms to the left:
2d-1-(3/4d+9)=0
Domain of the equation: 4d+9)!=0We get rid of parentheses
d∈R
2d-3/4d-9-1=0
We multiply all the terms by the denominator
2d*4d-9*4d-1*4d-3=0
Wy multiply elements
8d^2-36d-4d-3=0
We add all the numbers together, and all the variables
8d^2-40d-3=0
a = 8; b = -40; c = -3;
Δ = b2-4ac
Δ = -402-4·8·(-3)
Δ = 1696
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}$$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1696}=\sqrt{16*106}=\sqrt{16}*\sqrt{106}=4\sqrt{106}$$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-40)-4\sqrt{106}}{2*8}=\frac{40-4\sqrt{106}}{16} $$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-40)+4\sqrt{106}}{2*8}=\frac{40+4\sqrt{106}}{16} $
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