49(t)=4.9t^2

Solution for 49(t)=4.9t^2 equation:

49(t)=4.9t^2

We move all terms to the left:

49(t)-(4.9t^2)=0

We get rid of parentheses

-4.9t^2+49t=0

a = -4.9; b = 49; c = 0;
Δ = b2-4ac
Δ = 492-4·(-4.9)·0
Δ = 2401
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{2401}=49$
$t_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(49)-49}{2*-4.9}=\frac{-98}{-9.8}
=+10
$
$t_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(49)+49}{2*-4.9}=\frac{0}{-9.8}
=0
$