(8t-7)(3t+5)=5

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Solution for (8t-7)(3t+5)=5 equation:


Simplifying
(8t + -7)(3t + 5) = 5

Reorder the terms:
(-7 + 8t)(3t + 5) = 5

Reorder the terms:
(-7 + 8t)(5 + 3t) = 5

Multiply (-7 + 8t) * (5 + 3t)
(-7(5 + 3t) + 8t * (5 + 3t)) = 5
((5 * -7 + 3t * -7) + 8t * (5 + 3t)) = 5
((-35 + -21t) + 8t * (5 + 3t)) = 5
(-35 + -21t + (5 * 8t + 3t * 8t)) = 5
(-35 + -21t + (40t + 24t2)) = 5

Combine like terms: -21t + 40t = 19t
(-35 + 19t + 24t2) = 5

Solving
-35 + 19t + 24t2 = 5

Solving for variable 't'.

Reorder the terms:
-35 + -5 + 19t + 24t2 = 5 + -5

Combine like terms: -35 + -5 = -40
-40 + 19t + 24t2 = 5 + -5

Combine like terms: 5 + -5 = 0
-40 + 19t + 24t2 = 0

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

Divide each side by '24'.
-1.666666667 + 0.7916666667t + t2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 0.7916666667t + 1.666666667 + t2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 0.7916666667t + t2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 0.7916666667t + t2 = 0 + 1.666666667
0.7916666667t + t2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
0.7916666667t + t2 = 1.666666667

The t term is 0.7916666667t.  Take half its coefficient (0.3958333334).
Square it (0.1566840278) and add it to both sides.

Add '0.1566840278' to each side of the equation.
0.7916666667t + 0.1566840278 + t2 = 1.666666667 + 0.1566840278

Reorder the terms:
0.1566840278 + 0.7916666667t + t2 = 1.666666667 + 0.1566840278

Combine like terms: 1.666666667 + 0.1566840278 = 1.8233506948
0.1566840278 + 0.7916666667t + t2 = 1.8233506948

Factor a perfect square on the left side:
(t + 0.3958333334)(t + 0.3958333334) = 1.8233506948

Calculate the square root of the right side: 1.350315035

Break this problem into two subproblems by setting 
(t + 0.3958333334) equal to 1.350315035 and -1.350315035.

Subproblem 1

t + 0.3958333334 = 1.350315035 Simplifying t + 0.3958333334 = 1.350315035 Reorder the terms: 0.3958333334 + t = 1.350315035 Solving 0.3958333334 + t = 1.350315035 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3958333334' to each side of the equation. 0.3958333334 + -0.3958333334 + t = 1.350315035 + -0.3958333334 Combine like terms: 0.3958333334 + -0.3958333334 = 0.0000000000 0.0000000000 + t = 1.350315035 + -0.3958333334 t = 1.350315035 + -0.3958333334 Combine like terms: 1.350315035 + -0.3958333334 = 0.9544817016 t = 0.9544817016 Simplifying t = 0.9544817016

Subproblem 2

t + 0.3958333334 = -1.350315035 Simplifying t + 0.3958333334 = -1.350315035 Reorder the terms: 0.3958333334 + t = -1.350315035 Solving 0.3958333334 + t = -1.350315035 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3958333334' to each side of the equation. 0.3958333334 + -0.3958333334 + t = -1.350315035 + -0.3958333334 Combine like terms: 0.3958333334 + -0.3958333334 = 0.0000000000 0.0000000000 + t = -1.350315035 + -0.3958333334 t = -1.350315035 + -0.3958333334 Combine like terms: -1.350315035 + -0.3958333334 = -1.7461483684 t = -1.7461483684 Simplifying t = -1.7461483684

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.9544817016, -1.7461483684}

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