7-3t=2t^2

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Solution for 7-3t=2t^2 equation:


Simplifying
7 + -3t = 2t2

Solving
7 + -3t = 2t2

Solving for variable 't'.

Combine like terms: 2t2 + -2t2 = 0
7 + -3t + -2t2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-3.5 + 1.5t + t2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 1.5t + 3.5 + t2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 1.5t + t2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 1.5t + t2 = 0 + 3.5
1.5t + t2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
1.5t + t2 = 3.5

The t term is 1.5t.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5t + 0.5625 + t2 = 3.5 + 0.5625

Reorder the terms:
0.5625 + 1.5t + t2 = 3.5 + 0.5625

Combine like terms: 3.5 + 0.5625 = 4.0625
0.5625 + 1.5t + t2 = 4.0625

Factor a perfect square on the left side:
(t + 0.75)(t + 0.75) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(t + 0.75) equal to 2.015564437 and -2.015564437.

Subproblem 1

t + 0.75 = 2.015564437 Simplifying t + 0.75 = 2.015564437 Reorder the terms: 0.75 + t = 2.015564437 Solving 0.75 + t = 2.015564437 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + t = 2.015564437 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + t = 2.015564437 + -0.75 t = 2.015564437 + -0.75 Combine like terms: 2.015564437 + -0.75 = 1.265564437 t = 1.265564437 Simplifying t = 1.265564437

Subproblem 2

t + 0.75 = -2.015564437 Simplifying t + 0.75 = -2.015564437 Reorder the terms: 0.75 + t = -2.015564437 Solving 0.75 + t = -2.015564437 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + t = -2.015564437 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + t = -2.015564437 + -0.75 t = -2.015564437 + -0.75 Combine like terms: -2.015564437 + -0.75 = -2.765564437 t = -2.765564437 Simplifying t = -2.765564437

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.265564437, -2.765564437}

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