4.9t^2-17t-60=0

Solution for 4.9t^2-17t-60=0 equation:

4.9t^2-17t-60=0

a = 4.9; b = -17; c = -60;
Δ = b2-4ac
Δ = -172-4·4.9·(-60)
Δ = 1465
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-\sqrt{1465}}{2*4.9}=\frac{17-\sqrt{1465}}{9.8}
$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+\sqrt{1465}}{2*4.9}=\frac{17+\sqrt{1465}}{9.8}
$