0=-4t^2+t+9

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Solution for 0=-4t^2+t+9 equation:


Simplifying
0 = -4t2 + t + 9

Reorder the terms:
0 = 9 + t + -4t2

Solving
0 = 9 + t + -4t2

Solving for variable 't'.

Combine like terms: 0 + -9 = -9
-9 + -1t + 4t2 = 9 + t + -4t2 + -9 + -1t + 4t2

Reorder the terms:
-9 + -1t + 4t2 = 9 + -9 + t + -1t + -4t2 + 4t2

Combine like terms: 9 + -9 = 0
-9 + -1t + 4t2 = 0 + t + -1t + -4t2 + 4t2
-9 + -1t + 4t2 = t + -1t + -4t2 + 4t2

Combine like terms: t + -1t = 0
-9 + -1t + 4t2 = 0 + -4t2 + 4t2
-9 + -1t + 4t2 = -4t2 + 4t2

Combine like terms: -4t2 + 4t2 = 0
-9 + -1t + 4t2 = 0

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

Divide each side by '4'.
-2.25 + -0.25t + t2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -0.25t + 2.25 + t2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -0.25t + t2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -0.25t + t2 = 0 + 2.25
-0.25t + t2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-0.25t + t2 = 2.25

The t term is -0.25t.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25t + 0.015625 + t2 = 2.25 + 0.015625

Reorder the terms:
0.015625 + -0.25t + t2 = 2.25 + 0.015625

Combine like terms: 2.25 + 0.015625 = 2.265625
0.015625 + -0.25t + t2 = 2.265625

Factor a perfect square on the left side:
(t + -0.125)(t + -0.125) = 2.265625

Calculate the square root of the right side: 1.505199322

Break this problem into two subproblems by setting 
(t + -0.125) equal to 1.505199322 and -1.505199322.

Subproblem 1

t + -0.125 = 1.505199322 Simplifying t + -0.125 = 1.505199322 Reorder the terms: -0.125 + t = 1.505199322 Solving -0.125 + t = 1.505199322 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = 1.505199322 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = 1.505199322 + 0.125 t = 1.505199322 + 0.125 Combine like terms: 1.505199322 + 0.125 = 1.630199322 t = 1.630199322 Simplifying t = 1.630199322

Subproblem 2

t + -0.125 = -1.505199322 Simplifying t + -0.125 = -1.505199322 Reorder the terms: -0.125 + t = -1.505199322 Solving -0.125 + t = -1.505199322 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + t = -1.505199322 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + t = -1.505199322 + 0.125 t = -1.505199322 + 0.125 Combine like terms: -1.505199322 + 0.125 = -1.380199322 t = -1.380199322 Simplifying t = -1.380199322

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.630199322, -1.380199322}

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