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1/4y-9y=14
We move all terms to the left:
1/4y-9y-(14)=0
Domain of the equation: 4y!=0We add all the numbers together, and all the variables
y!=0/4
y!=0
y∈R
-9y+1/4y-14=0
We multiply all the terms by the denominator
-9y*4y-14*4y+1=0
Wy multiply elements
-36y^2-56y+1=0
a = -36; b = -56; c = +1;
Δ = b2-4ac
Δ = -562-4·(-36)·1
Δ = 3280
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3280}=\sqrt{16*205}=\sqrt{16}*\sqrt{205}=4\sqrt{205}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-56)-4\sqrt{205}}{2*-36}=\frac{56-4\sqrt{205}}{-72} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-56)+4\sqrt{205}}{2*-36}=\frac{56+4\sqrt{205}}{-72} $
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