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(2y-16)(2y-18)=150
We move all terms to the left:
(2y-16)(2y-18)-(150)=0
We multiply parentheses ..
(+4y^2-36y-32y+288)-150=0
We get rid of parentheses
4y^2-36y-32y+288-150=0
We add all the numbers together, and all the variables
4y^2-68y+138=0
a = 4; b = -68; c = +138;
Δ = b2-4ac
Δ = -682-4·4·138
Δ = 2416
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}$$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2416}=\sqrt{16*151}=\sqrt{16}*\sqrt{151}=4\sqrt{151}$$y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-68)-4\sqrt{151}}{2*4}=\frac{68-4\sqrt{151}}{8} $$y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-68)+4\sqrt{151}}{2*4}=\frac{68+4\sqrt{151}}{8} $
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