0=-16t^2+90t+575

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Solution for 0=-16t^2+90t+575 equation:


Simplifying
0 = -16t2 + 90t + 575

Reorder the terms:
0 = 575 + 90t + -16t2

Solving
0 = 575 + 90t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -575 = -575
-575 + -90t + 16t2 = 575 + 90t + -16t2 + -575 + -90t + 16t2

Reorder the terms:
-575 + -90t + 16t2 = 575 + -575 + 90t + -90t + -16t2 + 16t2

Combine like terms: 575 + -575 = 0
-575 + -90t + 16t2 = 0 + 90t + -90t + -16t2 + 16t2
-575 + -90t + 16t2 = 90t + -90t + -16t2 + 16t2

Combine like terms: 90t + -90t = 0
-575 + -90t + 16t2 = 0 + -16t2 + 16t2
-575 + -90t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-575 + -90t + 16t2 = 0

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

Divide each side by '16'.
-35.9375 + -5.625t + t2 = 0

Move the constant term to the right:

Add '35.9375' to each side of the equation.
-35.9375 + -5.625t + 35.9375 + t2 = 0 + 35.9375

Reorder the terms:
-35.9375 + 35.9375 + -5.625t + t2 = 0 + 35.9375

Combine like terms: -35.9375 + 35.9375 = 0.0000
0.0000 + -5.625t + t2 = 0 + 35.9375
-5.625t + t2 = 0 + 35.9375

Combine like terms: 0 + 35.9375 = 35.9375
-5.625t + t2 = 35.9375

The t term is -5.625t.  Take half its coefficient (-2.8125).
Square it (7.91015625) and add it to both sides.

Add '7.91015625' to each side of the equation.
-5.625t + 7.91015625 + t2 = 35.9375 + 7.91015625

Reorder the terms:
7.91015625 + -5.625t + t2 = 35.9375 + 7.91015625

Combine like terms: 35.9375 + 7.91015625 = 43.84765625
7.91015625 + -5.625t + t2 = 43.84765625

Factor a perfect square on the left side:
(t + -2.8125)(t + -2.8125) = 43.84765625

Calculate the square root of the right side: 6.621756281

Break this problem into two subproblems by setting 
(t + -2.8125) equal to 6.621756281 and -6.621756281.

Subproblem 1

t + -2.8125 = 6.621756281 Simplifying t + -2.8125 = 6.621756281 Reorder the terms: -2.8125 + t = 6.621756281 Solving -2.8125 + t = 6.621756281 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.8125' to each side of the equation. -2.8125 + 2.8125 + t = 6.621756281 + 2.8125 Combine like terms: -2.8125 + 2.8125 = 0.0000 0.0000 + t = 6.621756281 + 2.8125 t = 6.621756281 + 2.8125 Combine like terms: 6.621756281 + 2.8125 = 9.434256281 t = 9.434256281 Simplifying t = 9.434256281

Subproblem 2

t + -2.8125 = -6.621756281 Simplifying t + -2.8125 = -6.621756281 Reorder the terms: -2.8125 + t = -6.621756281 Solving -2.8125 + t = -6.621756281 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.8125' to each side of the equation. -2.8125 + 2.8125 + t = -6.621756281 + 2.8125 Combine like terms: -2.8125 + 2.8125 = 0.0000 0.0000 + t = -6.621756281 + 2.8125 t = -6.621756281 + 2.8125 Combine like terms: -6.621756281 + 2.8125 = -3.809256281 t = -3.809256281 Simplifying t = -3.809256281

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.434256281, -3.809256281}

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