4t^2+19t-28=0

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Solution for 4t^2+19t-28=0 equation:


Simplifying
4t2 + 19t + -28 = 0

Reorder the terms:
-28 + 19t + 4t2 = 0

Solving
-28 + 19t + 4t2 = 0

Solving for variable 't'.

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

Divide each side by '4'.
-7 + 4.75t + t2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 4.75t + 7 + t2 = 0 + 7

Reorder the terms:
-7 + 7 + 4.75t + t2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 4.75t + t2 = 0 + 7
4.75t + t2 = 0 + 7

Combine like terms: 0 + 7 = 7
4.75t + t2 = 7

The t term is 4.75t.  Take half its coefficient (2.375).
Square it (5.640625) and add it to both sides.

Add '5.640625' to each side of the equation.
4.75t + 5.640625 + t2 = 7 + 5.640625

Reorder the terms:
5.640625 + 4.75t + t2 = 7 + 5.640625

Combine like terms: 7 + 5.640625 = 12.640625
5.640625 + 4.75t + t2 = 12.640625

Factor a perfect square on the left side:
(t + 2.375)(t + 2.375) = 12.640625

Calculate the square root of the right side: 3.555365663

Break this problem into two subproblems by setting 
(t + 2.375) equal to 3.555365663 and -3.555365663.

Subproblem 1

t + 2.375 = 3.555365663 Simplifying t + 2.375 = 3.555365663 Reorder the terms: 2.375 + t = 3.555365663 Solving 2.375 + t = 3.555365663 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + t = 3.555365663 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + t = 3.555365663 + -2.375 t = 3.555365663 + -2.375 Combine like terms: 3.555365663 + -2.375 = 1.180365663 t = 1.180365663 Simplifying t = 1.180365663

Subproblem 2

t + 2.375 = -3.555365663 Simplifying t + 2.375 = -3.555365663 Reorder the terms: 2.375 + t = -3.555365663 Solving 2.375 + t = -3.555365663 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-2.375' to each side of the equation. 2.375 + -2.375 + t = -3.555365663 + -2.375 Combine like terms: 2.375 + -2.375 = 0.000 0.000 + t = -3.555365663 + -2.375 t = -3.555365663 + -2.375 Combine like terms: -3.555365663 + -2.375 = -5.930365663 t = -5.930365663 Simplifying t = -5.930365663

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.180365663, -5.930365663}

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