7=-2t+4.9t^2

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Solution for 7=-2t+4.9t^2 equation:


Simplifying
7 = -2t + 4.9t2

Solving
7 = -2t + 4.9t2

Solving for variable 't'.

Reorder the terms:
7 + 2t + -4.9t2 = -2t + 2t + 4.9t2 + -4.9t2

Combine like terms: -2t + 2t = 0
7 + 2t + -4.9t2 = 0 + 4.9t2 + -4.9t2
7 + 2t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
7 + 2t + -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'.
-1.428571429 + -0.4081632653t + t2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + -0.4081632653t + 1.428571429 + t2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + -0.4081632653t + t2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + -0.4081632653t + t2 = 0 + 1.428571429
-0.4081632653t + t2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
-0.4081632653t + t2 = 1.428571429

The t term is -0.4081632653t.  Take half its coefficient (-0.2040816327).
Square it (0.04164931281) and add it to both sides.

Add '0.04164931281' to each side of the equation.
-0.4081632653t + 0.04164931281 + t2 = 1.428571429 + 0.04164931281

Reorder the terms:
0.04164931281 + -0.4081632653t + t2 = 1.428571429 + 0.04164931281

Combine like terms: 1.428571429 + 0.04164931281 = 1.47022074181
0.04164931281 + -0.4081632653t + t2 = 1.47022074181

Factor a perfect square on the left side:
(t + -0.2040816327)(t + -0.2040816327) = 1.47022074181

Calculate the square root of the right side: 1.212526594

Break this problem into two subproblems by setting 
(t + -0.2040816327) equal to 1.212526594 and -1.212526594.

Subproblem 1

t + -0.2040816327 = 1.212526594 Simplifying t + -0.2040816327 = 1.212526594 Reorder the terms: -0.2040816327 + t = 1.212526594 Solving -0.2040816327 + t = 1.212526594 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.2040816327' to each side of the equation. -0.2040816327 + 0.2040816327 + t = 1.212526594 + 0.2040816327 Combine like terms: -0.2040816327 + 0.2040816327 = 0.0000000000 0.0000000000 + t = 1.212526594 + 0.2040816327 t = 1.212526594 + 0.2040816327 Combine like terms: 1.212526594 + 0.2040816327 = 1.4166082267 t = 1.4166082267 Simplifying t = 1.4166082267

Subproblem 2

t + -0.2040816327 = -1.212526594 Simplifying t + -0.2040816327 = -1.212526594 Reorder the terms: -0.2040816327 + t = -1.212526594 Solving -0.2040816327 + t = -1.212526594 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.2040816327' to each side of the equation. -0.2040816327 + 0.2040816327 + t = -1.212526594 + 0.2040816327 Combine like terms: -0.2040816327 + 0.2040816327 = 0.0000000000 0.0000000000 + t = -1.212526594 + 0.2040816327 t = -1.212526594 + 0.2040816327 Combine like terms: -1.212526594 + 0.2040816327 = -1.0084449613 t = -1.0084449613 Simplifying t = -1.0084449613

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.4166082267, -1.0084449613}

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