-10t^2+9t+90=0

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Solution for -10t^2+9t+90=0 equation:


Simplifying
-10t2 + 9t + 90 = 0

Reorder the terms:
90 + 9t + -10t2 = 0

Solving
90 + 9t + -10t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-9 + -0.9t + t2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -0.9t + 9 + t2 = 0 + 9

Reorder the terms:
-9 + 9 + -0.9t + t2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -0.9t + t2 = 0 + 9
-0.9t + t2 = 0 + 9

Combine like terms: 0 + 9 = 9
-0.9t + t2 = 9

The t term is -0.9t.  Take half its coefficient (-0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
-0.9t + 0.2025 + t2 = 9 + 0.2025

Reorder the terms:
0.2025 + -0.9t + t2 = 9 + 0.2025

Combine like terms: 9 + 0.2025 = 9.2025
0.2025 + -0.9t + t2 = 9.2025

Factor a perfect square on the left side:
(t + -0.45)(t + -0.45) = 9.2025

Calculate the square root of the right side: 3.033562262

Break this problem into two subproblems by setting 
(t + -0.45) equal to 3.033562262 and -3.033562262.

Subproblem 1

t + -0.45 = 3.033562262 Simplifying t + -0.45 = 3.033562262 Reorder the terms: -0.45 + t = 3.033562262 Solving -0.45 + t = 3.033562262 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + t = 3.033562262 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + t = 3.033562262 + 0.45 t = 3.033562262 + 0.45 Combine like terms: 3.033562262 + 0.45 = 3.483562262 t = 3.483562262 Simplifying t = 3.483562262

Subproblem 2

t + -0.45 = -3.033562262 Simplifying t + -0.45 = -3.033562262 Reorder the terms: -0.45 + t = -3.033562262 Solving -0.45 + t = -3.033562262 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.45' to each side of the equation. -0.45 + 0.45 + t = -3.033562262 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + t = -3.033562262 + 0.45 t = -3.033562262 + 0.45 Combine like terms: -3.033562262 + 0.45 = -2.583562262 t = -2.583562262 Simplifying t = -2.583562262

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.483562262, -2.583562262}

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