14t^2+15t-20=0

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Solution for 14t^2+15t-20=0 equation:


Simplifying
14t2 + 15t + -20 = 0

Reorder the terms:
-20 + 15t + 14t2 = 0

Solving
-20 + 15t + 14t2 = 0

Solving for variable 't'.

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

Divide each side by '14'.
-1.428571429 + 1.071428571t + t2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + 1.071428571t + 1.428571429 + t2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + 1.071428571t + t2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + 1.071428571t + t2 = 0 + 1.428571429
1.071428571t + t2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
1.071428571t + t2 = 1.428571429

The t term is 1.071428571t.  Take half its coefficient (0.5357142855).
Square it (0.2869897957) and add it to both sides.

Add '0.2869897957' to each side of the equation.
1.071428571t + 0.2869897957 + t2 = 1.428571429 + 0.2869897957

Reorder the terms:
0.2869897957 + 1.071428571t + t2 = 1.428571429 + 0.2869897957

Combine like terms: 1.428571429 + 0.2869897957 = 1.7155612247
0.2869897957 + 1.071428571t + t2 = 1.7155612247

Factor a perfect square on the left side:
(t + 0.5357142855)(t + 0.5357142855) = 1.7155612247

Calculate the square root of the right side: 1.309794344

Break this problem into two subproblems by setting 
(t + 0.5357142855) equal to 1.309794344 and -1.309794344.

Subproblem 1

t + 0.5357142855 = 1.309794344 Simplifying t + 0.5357142855 = 1.309794344 Reorder the terms: 0.5357142855 + t = 1.309794344 Solving 0.5357142855 + t = 1.309794344 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5357142855' to each side of the equation. 0.5357142855 + -0.5357142855 + t = 1.309794344 + -0.5357142855 Combine like terms: 0.5357142855 + -0.5357142855 = 0.0000000000 0.0000000000 + t = 1.309794344 + -0.5357142855 t = 1.309794344 + -0.5357142855 Combine like terms: 1.309794344 + -0.5357142855 = 0.7740800585 t = 0.7740800585 Simplifying t = 0.7740800585

Subproblem 2

t + 0.5357142855 = -1.309794344 Simplifying t + 0.5357142855 = -1.309794344 Reorder the terms: 0.5357142855 + t = -1.309794344 Solving 0.5357142855 + t = -1.309794344 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5357142855' to each side of the equation. 0.5357142855 + -0.5357142855 + t = -1.309794344 + -0.5357142855 Combine like terms: 0.5357142855 + -0.5357142855 = 0.0000000000 0.0000000000 + t = -1.309794344 + -0.5357142855 t = -1.309794344 + -0.5357142855 Combine like terms: -1.309794344 + -0.5357142855 = -1.8455086295 t = -1.8455086295 Simplifying t = -1.8455086295

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.7740800585, -1.8455086295}

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