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3/4a+18-a+4=8
We move all terms to the left:
3/4a+18-a+4-(8)=0
Domain of the equation: 4a!=0We add all the numbers together, and all the variables
a!=0/4
a!=0
a∈R
-1a+3/4a+14=0
We multiply all the terms by the denominator
-1a*4a+14*4a+3=0
Wy multiply elements
-4a^2+56a+3=0
a = -4; b = 56; c = +3;
Δ = b2-4ac
Δ = 562-4·(-4)·3
Δ = 3184
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}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3184}=\sqrt{16*199}=\sqrt{16}*\sqrt{199}=4\sqrt{199}$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(56)-4\sqrt{199}}{2*-4}=\frac{-56-4\sqrt{199}}{-8} $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(56)+4\sqrt{199}}{2*-4}=\frac{-56+4\sqrt{199}}{-8} $
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