1400=80t-t^2

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Solution for 1400=80t-t^2 equation:


Simplifying
1400 = 80t + -1t2

Solving
1400 = 80t + -1t2

Solving for variable 't'.

Reorder the terms:
1400 + -80t + t2 = 80t + -80t + -1t2 + t2

Combine like terms: 80t + -80t = 0
1400 + -80t + t2 = 0 + -1t2 + t2
1400 + -80t + t2 = -1t2 + t2

Combine like terms: -1t2 + t2 = 0
1400 + -80t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-1400' to each side of the equation.
1400 + -80t + -1400 + t2 = 0 + -1400

Reorder the terms:
1400 + -1400 + -80t + t2 = 0 + -1400

Combine like terms: 1400 + -1400 = 0
0 + -80t + t2 = 0 + -1400
-80t + t2 = 0 + -1400

Combine like terms: 0 + -1400 = -1400
-80t + t2 = -1400

The t term is -80t.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80t + 1600 + t2 = -1400 + 1600

Reorder the terms:
1600 + -80t + t2 = -1400 + 1600

Combine like terms: -1400 + 1600 = 200
1600 + -80t + t2 = 200

Factor a perfect square on the left side:
(t + -40)(t + -40) = 200

Calculate the square root of the right side: 14.142135624

Break this problem into two subproblems by setting 
(t + -40) equal to 14.142135624 and -14.142135624.

Subproblem 1

t + -40 = 14.142135624 Simplifying t + -40 = 14.142135624 Reorder the terms: -40 + t = 14.142135624 Solving -40 + t = 14.142135624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + t = 14.142135624 + 40 Combine like terms: -40 + 40 = 0 0 + t = 14.142135624 + 40 t = 14.142135624 + 40 Combine like terms: 14.142135624 + 40 = 54.142135624 t = 54.142135624 Simplifying t = 54.142135624

Subproblem 2

t + -40 = -14.142135624 Simplifying t + -40 = -14.142135624 Reorder the terms: -40 + t = -14.142135624 Solving -40 + t = -14.142135624 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + t = -14.142135624 + 40 Combine like terms: -40 + 40 = 0 0 + t = -14.142135624 + 40 t = -14.142135624 + 40 Combine like terms: -14.142135624 + 40 = 25.857864376 t = 25.857864376 Simplifying t = 25.857864376

Solution

The solution to the problem is based on the solutions from the subproblems. t = {54.142135624, 25.857864376}

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