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2(7/16a+5)=7/8a
We move all terms to the left:
2(7/16a+5)-(7/8a)=0
Domain of the equation: 16a+5)!=0
a∈R
Domain of the equation: 8a)!=0We add all the numbers together, and all the variables
a!=0/1
a!=0
a∈R
2(7/16a+5)-(+7/8a)=0
We multiply parentheses
14a-(+7/8a)+10=0
We get rid of parentheses
14a-7/8a+10=0
We multiply all the terms by the denominator
14a*8a+10*8a-7=0
Wy multiply elements
112a^2+80a-7=0
a = 112; b = 80; c = -7;
Δ = b2-4ac
Δ = 802-4·112·(-7)
Δ = 9536
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}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{9536}=\sqrt{64*149}=\sqrt{64}*\sqrt{149}=8\sqrt{149}$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(80)-8\sqrt{149}}{2*112}=\frac{-80-8\sqrt{149}}{224} $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(80)+8\sqrt{149}}{2*112}=\frac{-80+8\sqrt{149}}{224} $
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