Q^2-25Q=1600

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Solution for Q^2-25Q=1600 equation:


Simplifying
Q2 + -25Q = 1600

Reorder the terms:
-25Q + Q2 = 1600

Solving
-25Q + Q2 = 1600

Solving for variable 'Q'.

Reorder the terms:
-1600 + -25Q + Q2 = 1600 + -1600

Combine like terms: 1600 + -1600 = 0
-1600 + -25Q + Q2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + -25Q + 1600 + Q2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + -25Q + Q2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + -25Q + Q2 = 0 + 1600
-25Q + Q2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
-25Q + Q2 = 1600

The Q term is -25Q.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25Q + 156.25 + Q2 = 1600 + 156.25

Reorder the terms:
156.25 + -25Q + Q2 = 1600 + 156.25

Combine like terms: 1600 + 156.25 = 1756.25
156.25 + -25Q + Q2 = 1756.25

Factor a perfect square on the left side:
(Q + -12.5)(Q + -12.5) = 1756.25

Calculate the square root of the right side: 41.907636536

Break this problem into two subproblems by setting 
(Q + -12.5) equal to 41.907636536 and -41.907636536.

Subproblem 1

Q + -12.5 = 41.907636536 Simplifying Q + -12.5 = 41.907636536 Reorder the terms: -12.5 + Q = 41.907636536 Solving -12.5 + Q = 41.907636536 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + Q = 41.907636536 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + Q = 41.907636536 + 12.5 Q = 41.907636536 + 12.5 Combine like terms: 41.907636536 + 12.5 = 54.407636536 Q = 54.407636536 Simplifying Q = 54.407636536

Subproblem 2

Q + -12.5 = -41.907636536 Simplifying Q + -12.5 = -41.907636536 Reorder the terms: -12.5 + Q = -41.907636536 Solving -12.5 + Q = -41.907636536 Solving for variable 'Q'. Move all terms containing Q to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + Q = -41.907636536 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + Q = -41.907636536 + 12.5 Q = -41.907636536 + 12.5 Combine like terms: -41.907636536 + 12.5 = -29.407636536 Q = -29.407636536 Simplifying Q = -29.407636536

Solution

The solution to the problem is based on the solutions from the subproblems. Q = {54.407636536, -29.407636536}

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