1.25t^2+2.1t-50.0=0

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Solution for 1.25t^2+2.1t-50.0=0 equation:


Simplifying
1.25t2 + 2.1t + -50.0 = 0

Reorder the terms:
-50.0 + 2.1t + 1.25t2 = 0

Solving
-50.0 + 2.1t + 1.25t2 = 0

Solving for variable 't'.

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

Divide each side by '1.25'.
-40 + 1.68t + t2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + 1.68t + 40 + t2 = 0 + 40

Reorder the terms:
-40 + 40 + 1.68t + t2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 1.68t + t2 = 0 + 40
1.68t + t2 = 0 + 40

Combine like terms: 0 + 40 = 40
1.68t + t2 = 40

The t term is 1.68t.  Take half its coefficient (0.84).
Square it (0.7056) and add it to both sides.

Add '0.7056' to each side of the equation.
1.68t + 0.7056 + t2 = 40 + 0.7056

Reorder the terms:
0.7056 + 1.68t + t2 = 40 + 0.7056

Combine like terms: 40 + 0.7056 = 40.7056
0.7056 + 1.68t + t2 = 40.7056

Factor a perfect square on the left side:
(t + 0.84)(t + 0.84) = 40.7056

Calculate the square root of the right side: 6.380094043

Break this problem into two subproblems by setting 
(t + 0.84) equal to 6.380094043 and -6.380094043.

Subproblem 1

t + 0.84 = 6.380094043 Simplifying t + 0.84 = 6.380094043 Reorder the terms: 0.84 + t = 6.380094043 Solving 0.84 + t = 6.380094043 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.84' to each side of the equation. 0.84 + -0.84 + t = 6.380094043 + -0.84 Combine like terms: 0.84 + -0.84 = 0.00 0.00 + t = 6.380094043 + -0.84 t = 6.380094043 + -0.84 Combine like terms: 6.380094043 + -0.84 = 5.540094043 t = 5.540094043 Simplifying t = 5.540094043

Subproblem 2

t + 0.84 = -6.380094043 Simplifying t + 0.84 = -6.380094043 Reorder the terms: 0.84 + t = -6.380094043 Solving 0.84 + t = -6.380094043 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.84' to each side of the equation. 0.84 + -0.84 + t = -6.380094043 + -0.84 Combine like terms: 0.84 + -0.84 = 0.00 0.00 + t = -6.380094043 + -0.84 t = -6.380094043 + -0.84 Combine like terms: -6.380094043 + -0.84 = -7.220094043 t = -7.220094043 Simplifying t = -7.220094043

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.540094043, -7.220094043}

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