4.9t^2+6t-300=0

Solution for 4.9t^2+6t-300=0 equation:

4.9t^2+6t-300=0

a = 4.9; b = 6; c = -300;
Δ = b2-4ac
Δ = 62-4·4.9·(-300)
Δ = 5916
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:

$\sqrt{\Delta}=\sqrt{5916}=\sqrt{4*1479}=\sqrt{4}*\sqrt{1479}=2\sqrt{1479}$
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{1479}}{2*4.9}=\frac{-6-2\sqrt{1479}}{9.8}
$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{1479}}{2*4.9}=\frac{-6+2\sqrt{1479}}{9.8}
$