70=-4.9t^2+19.6t+58.8

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Solution for 70=-4.9t^2+19.6t+58.8 equation:


Simplifying
70 = -4.9t2 + 19.6t + 58.8

Reorder the terms:
70 = 58.8 + 19.6t + -4.9t2

Solving
70 = 58.8 + 19.6t + -4.9t2

Solving for variable 't'.

Combine like terms: 70 + -58.8 = 11.2
11.2 + -19.6t + 4.9t2 = 58.8 + 19.6t + -4.9t2 + -58.8 + -19.6t + 4.9t2

Reorder the terms:
11.2 + -19.6t + 4.9t2 = 58.8 + -58.8 + 19.6t + -19.6t + -4.9t2 + 4.9t2

Combine like terms: 58.8 + -58.8 = 0.0
11.2 + -19.6t + 4.9t2 = 0.0 + 19.6t + -19.6t + -4.9t2 + 4.9t2
11.2 + -19.6t + 4.9t2 = 19.6t + -19.6t + -4.9t2 + 4.9t2

Combine like terms: 19.6t + -19.6t = 0.0
11.2 + -19.6t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
11.2 + -19.6t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
11.2 + -19.6t + 4.9t2 = 0.0

Begin completing the square.  Divide all terms by
4.9 the coefficient of the squared term: 

Divide each side by '4.9'.
2.285714286 + -4t + t2 = 0

Move the constant term to the right:

Add '-2.285714286' to each side of the equation.
2.285714286 + -4t + -2.285714286 + t2 = 0 + -2.285714286

Reorder the terms:
2.285714286 + -2.285714286 + -4t + t2 = 0 + -2.285714286

Combine like terms: 2.285714286 + -2.285714286 = 0.000000000
0.000000000 + -4t + t2 = 0 + -2.285714286
-4t + t2 = 0 + -2.285714286

Combine like terms: 0 + -2.285714286 = -2.285714286
-4t + t2 = -2.285714286

The t term is -4t.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4t + 4 + t2 = -2.285714286 + 4

Reorder the terms:
4 + -4t + t2 = -2.285714286 + 4

Combine like terms: -2.285714286 + 4 = 1.714285714
4 + -4t + t2 = 1.714285714

Factor a perfect square on the left side:
(t + -2)(t + -2) = 1.714285714

Calculate the square root of the right side: 1.309307341

Break this problem into two subproblems by setting 
(t + -2) equal to 1.309307341 and -1.309307341.

Subproblem 1

t + -2 = 1.309307341 Simplifying t + -2 = 1.309307341 Reorder the terms: -2 + t = 1.309307341 Solving -2 + t = 1.309307341 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = 1.309307341 + 2 Combine like terms: -2 + 2 = 0 0 + t = 1.309307341 + 2 t = 1.309307341 + 2 Combine like terms: 1.309307341 + 2 = 3.309307341 t = 3.309307341 Simplifying t = 3.309307341

Subproblem 2

t + -2 = -1.309307341 Simplifying t + -2 = -1.309307341 Reorder the terms: -2 + t = -1.309307341 Solving -2 + t = -1.309307341 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = -1.309307341 + 2 Combine like terms: -2 + 2 = 0 0 + t = -1.309307341 + 2 t = -1.309307341 + 2 Combine like terms: -1.309307341 + 2 = 0.690692659 t = 0.690692659 Simplifying t = 0.690692659

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.309307341, 0.690692659}

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