4t^2-7t-8=0

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Solution for 4t^2-7t-8=0 equation:


Simplifying
4t2 + -7t + -8 = 0

Reorder the terms:
-8 + -7t + 4t2 = 0

Solving
-8 + -7t + 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'.
-2 + -1.75t + t2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -1.75t + 2 + t2 = 0 + 2

Reorder the terms:
-2 + 2 + -1.75t + t2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1.75t + t2 = 0 + 2
-1.75t + t2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1.75t + t2 = 2

The t term is -1.75t.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75t + 0.765625 + t2 = 2 + 0.765625

Reorder the terms:
0.765625 + -1.75t + t2 = 2 + 0.765625

Combine like terms: 2 + 0.765625 = 2.765625
0.765625 + -1.75t + t2 = 2.765625

Factor a perfect square on the left side:
(t + -0.875)(t + -0.875) = 2.765625

Calculate the square root of the right side: 1.663016837

Break this problem into two subproblems by setting 
(t + -0.875) equal to 1.663016837 and -1.663016837.

Subproblem 1

t + -0.875 = 1.663016837 Simplifying t + -0.875 = 1.663016837 Reorder the terms: -0.875 + t = 1.663016837 Solving -0.875 + t = 1.663016837 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + t = 1.663016837 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + t = 1.663016837 + 0.875 t = 1.663016837 + 0.875 Combine like terms: 1.663016837 + 0.875 = 2.538016837 t = 2.538016837 Simplifying t = 2.538016837

Subproblem 2

t + -0.875 = -1.663016837 Simplifying t + -0.875 = -1.663016837 Reorder the terms: -0.875 + t = -1.663016837 Solving -0.875 + t = -1.663016837 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + t = -1.663016837 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + t = -1.663016837 + 0.875 t = -1.663016837 + 0.875 Combine like terms: -1.663016837 + 0.875 = -0.788016837 t = -0.788016837 Simplifying t = -0.788016837

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.538016837, -0.788016837}

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