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60=t(16+t)
We move all terms to the left:
60-(t(16+t))=0
We add all the numbers together, and all the variables
-(t(t+16))+60=0
We calculate terms in parentheses: -(t(t+16)), so:We get rid of parentheses
t(t+16)
We multiply parentheses
t^2+16t
Back to the equation:
-(t^2+16t)
-t^2-16t+60=0
We add all the numbers together, and all the variables
-1t^2-16t+60=0
a = -1; b = -16; c = +60;
Δ = b2-4ac
Δ = -162-4·(-1)·60
Δ = 496
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{496}=\sqrt{16*31}=\sqrt{16}*\sqrt{31}=4\sqrt{31}$$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-16)-4\sqrt{31}}{2*-1}=\frac{16-4\sqrt{31}}{-2} $$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-16)+4\sqrt{31}}{2*-1}=\frac{16+4\sqrt{31}}{-2} $
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