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2(k-1)=10k(k-2)
We move all terms to the left:
2(k-1)-(10k(k-2))=0
We multiply parentheses
2k-(10k(k-2))-2=0
We calculate terms in parentheses: -(10k(k-2)), so:We get rid of parentheses
10k(k-2)
We multiply parentheses
10k^2-20k
Back to the equation:
-(10k^2-20k)
-10k^2+2k+20k-2=0
We add all the numbers together, and all the variables
-10k^2+22k-2=0
a = -10; b = 22; c = -2;
Δ = b2-4ac
Δ = 222-4·(-10)·(-2)
Δ = 404
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{404}=\sqrt{4*101}=\sqrt{4}*\sqrt{101}=2\sqrt{101}$$k_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(22)-2\sqrt{101}}{2*-10}=\frac{-22-2\sqrt{101}}{-20} $$k_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(22)+2\sqrt{101}}{2*-10}=\frac{-22+2\sqrt{101}}{-20} $
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