3x(7-x)=29

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Solution for 3x(7-x)=29 equation:


Simplifying
3x(7 + -1x) = 29
(7 * 3x + -1x * 3x) = 29
(21x + -3x2) = 29

Solving
21x + -3x2 = 29

Solving for variable 'x'.

Reorder the terms:
-29 + 21x + -3x2 = 29 + -29

Combine like terms: 29 + -29 = 0
-29 + 21x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
9.666666667 + -7x + x2 = 0

Move the constant term to the right:

Add '-9.666666667' to each side of the equation.
9.666666667 + -7x + -9.666666667 + x2 = 0 + -9.666666667

Reorder the terms:
9.666666667 + -9.666666667 + -7x + x2 = 0 + -9.666666667

Combine like terms: 9.666666667 + -9.666666667 = 0.000000000
0.000000000 + -7x + x2 = 0 + -9.666666667
-7x + x2 = 0 + -9.666666667

Combine like terms: 0 + -9.666666667 = -9.666666667
-7x + x2 = -9.666666667

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -9.666666667 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -9.666666667 + 12.25

Combine like terms: -9.666666667 + 12.25 = 2.583333333
12.25 + -7x + x2 = 2.583333333

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 2.583333333

Calculate the square root of the right side: 1.607275127

Break this problem into two subproblems by setting 
(x + -3.5) equal to 1.607275127 and -1.607275127.

Subproblem 1

x + -3.5 = 1.607275127 Simplifying x + -3.5 = 1.607275127 Reorder the terms: -3.5 + x = 1.607275127 Solving -3.5 + x = 1.607275127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 1.607275127 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 1.607275127 + 3.5 x = 1.607275127 + 3.5 Combine like terms: 1.607275127 + 3.5 = 5.107275127 x = 5.107275127 Simplifying x = 5.107275127

Subproblem 2

x + -3.5 = -1.607275127 Simplifying x + -3.5 = -1.607275127 Reorder the terms: -3.5 + x = -1.607275127 Solving -3.5 + x = -1.607275127 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -1.607275127 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -1.607275127 + 3.5 x = -1.607275127 + 3.5 Combine like terms: -1.607275127 + 3.5 = 1.892724873 x = 1.892724873 Simplifying x = 1.892724873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.107275127, 1.892724873}

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