4t^2-25t+28=0

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Solution for 4t^2-25t+28=0 equation:


Simplifying
4t2 + -25t + 28 = 0

Reorder the terms:
28 + -25t + 4t2 = 0

Solving
28 + -25t + 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 + -6.25t + t2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -6.25t + -7 + t2 = 0 + -7

Reorder the terms:
7 + -7 + -6.25t + t2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -6.25t + t2 = 0 + -7
-6.25t + t2 = 0 + -7

Combine like terms: 0 + -7 = -7
-6.25t + t2 = -7

The t term is -6.25t.  Take half its coefficient (-3.125).
Square it (9.765625) and add it to both sides.

Add '9.765625' to each side of the equation.
-6.25t + 9.765625 + t2 = -7 + 9.765625

Reorder the terms:
9.765625 + -6.25t + t2 = -7 + 9.765625

Combine like terms: -7 + 9.765625 = 2.765625
9.765625 + -6.25t + t2 = 2.765625

Factor a perfect square on the left side:
(t + -3.125)(t + -3.125) = 2.765625

Calculate the square root of the right side: 1.663016837

Break this problem into two subproblems by setting 
(t + -3.125) equal to 1.663016837 and -1.663016837.

Subproblem 1

t + -3.125 = 1.663016837 Simplifying t + -3.125 = 1.663016837 Reorder the terms: -3.125 + t = 1.663016837 Solving -3.125 + t = 1.663016837 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + t = 1.663016837 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + t = 1.663016837 + 3.125 t = 1.663016837 + 3.125 Combine like terms: 1.663016837 + 3.125 = 4.788016837 t = 4.788016837 Simplifying t = 4.788016837

Subproblem 2

t + -3.125 = -1.663016837 Simplifying t + -3.125 = -1.663016837 Reorder the terms: -3.125 + t = -1.663016837 Solving -3.125 + t = -1.663016837 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.125' to each side of the equation. -3.125 + 3.125 + t = -1.663016837 + 3.125 Combine like terms: -3.125 + 3.125 = 0.000 0.000 + t = -1.663016837 + 3.125 t = -1.663016837 + 3.125 Combine like terms: -1.663016837 + 3.125 = 1.461983163 t = 1.461983163 Simplifying t = 1.461983163

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.788016837, 1.461983163}

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