4t^2+16t-28=0

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Solution for 4t^2+16t-28=0 equation: 


Simplifying
4t2 + 16t + -28 = 0

Reorder the terms:
-28 + 16t + 4t2 = 0

Solving
-28 + 16t + 4t2 = 0

Solving for variable 't'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-7 + 4t + t2) = 0

Ignore the factor 4.

Subproblem 1
Set the factor '(-7 + 4t + t2)' equal to zero and attempt to solve:

Simplifying
-7 + 4t + t2 = 0

Solving
-7 + 4t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 4t + 7 + t2 = 0 + 7

Reorder the terms:
-7 + 7 + 4t + t2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 4t + t2 = 0 + 7
4t + t2 = 0 + 7

Combine like terms: 0 + 7 = 7
4t + t2 = 7

The t term is 4t.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4t + 4 + t2 = 7 + 4

Reorder the terms:
4 + 4t + t2 = 7 + 4

Combine like terms: 7 + 4 = 11
4 + 4t + t2 = 11

Factor a perfect square on the left side:
(t + 2)(t + 2) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(t + 2) equal to 3.31662479 and -3.31662479.


Subproblem 1
t + 2 = 3.31662479

Simplifying
t + 2 = 3.31662479

Reorder the terms:
2 + t = 3.31662479

Solving
2 + t = 3.31662479

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + t = 3.31662479 + -2

Combine like terms: 2 + -2 = 0
0 + t = 3.31662479 + -2
t = 3.31662479 + -2

Combine like terms: 3.31662479 + -2 = 1.31662479
t = 1.31662479

Simplifying
t = 1.31662479


Subproblem 2
t + 2 = -3.31662479

Simplifying
t + 2 = -3.31662479

Reorder the terms:
2 + t = -3.31662479

Solving
2 + t = -3.31662479

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '-2' to each side of the equation.
2 + -2 + t = -3.31662479 + -2

Combine like terms: 2 + -2 = 0
0 + t = -3.31662479 + -2
t = -3.31662479 + -2

Combine like terms: -3.31662479 + -2 = -5.31662479
t = -5.31662479

Simplifying
t = -5.31662479


Solution
The solution to the problem is based on the solutions
from the subproblems.
t = {1.31662479, -5.31662479}
Solution
t = {1.31662479, -5.31662479}

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