-100=-16t^2+45t

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Solution for -100=-16t^2+45t equation:


Simplifying
-100 = -16t2 + 45t

Reorder the terms:
-100 = 45t + -16t2

Solving
-100 = 45t + -16t2

Solving for variable 't'.

Reorder the terms:
-100 + -45t + 16t2 = 45t + -45t + -16t2 + 16t2

Combine like terms: 45t + -45t = 0
-100 + -45t + 16t2 = 0 + -16t2 + 16t2
-100 + -45t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-100 + -45t + 16t2 = 0

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

Divide each side by '16'.
-6.25 + -2.8125t + t2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -2.8125t + 6.25 + t2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -2.8125t + t2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -2.8125t + t2 = 0 + 6.25
-2.8125t + t2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-2.8125t + t2 = 6.25

The t term is -2.8125t.  Take half its coefficient (-1.40625).
Square it (1.977539063) and add it to both sides.

Add '1.977539063' to each side of the equation.
-2.8125t + 1.977539063 + t2 = 6.25 + 1.977539063

Reorder the terms:
1.977539063 + -2.8125t + t2 = 6.25 + 1.977539063

Combine like terms: 6.25 + 1.977539063 = 8.227539063
1.977539063 + -2.8125t + t2 = 8.227539063

Factor a perfect square on the left side:
(t + -1.40625)(t + -1.40625) = 8.227539063

Calculate the square root of the right side: 2.868368711

Break this problem into two subproblems by setting 
(t + -1.40625) equal to 2.868368711 and -2.868368711.

Subproblem 1

t + -1.40625 = 2.868368711 Simplifying t + -1.40625 = 2.868368711 Reorder the terms: -1.40625 + t = 2.868368711 Solving -1.40625 + t = 2.868368711 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.40625' to each side of the equation. -1.40625 + 1.40625 + t = 2.868368711 + 1.40625 Combine like terms: -1.40625 + 1.40625 = 0.00000 0.00000 + t = 2.868368711 + 1.40625 t = 2.868368711 + 1.40625 Combine like terms: 2.868368711 + 1.40625 = 4.274618711 t = 4.274618711 Simplifying t = 4.274618711

Subproblem 2

t + -1.40625 = -2.868368711 Simplifying t + -1.40625 = -2.868368711 Reorder the terms: -1.40625 + t = -2.868368711 Solving -1.40625 + t = -2.868368711 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.40625' to each side of the equation. -1.40625 + 1.40625 + t = -2.868368711 + 1.40625 Combine like terms: -1.40625 + 1.40625 = 0.00000 0.00000 + t = -2.868368711 + 1.40625 t = -2.868368711 + 1.40625 Combine like terms: -2.868368711 + 1.40625 = -1.462118711 t = -1.462118711 Simplifying t = -1.462118711

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.274618711, -1.462118711}

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