7x(x+4)=70

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Solution for 7x(x+4)=70 equation:


Simplifying
7x(x + 4) = 70

Reorder the terms:
7x(4 + x) = 70
(4 * 7x + x * 7x) = 70
(28x + 7x2) = 70

Solving
28x + 7x2 = 70

Solving for variable 'x'.

Reorder the terms:
-70 + 28x + 7x2 = 70 + -70

Combine like terms: 70 + -70 = 0
-70 + 28x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-10 + 4x + x2) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-10 + 4x + x2)' equal to zero and attempt to solve: Simplifying -10 + 4x + x2 = 0 Solving -10 + 4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '10' to each side of the equation. -10 + 4x + 10 + x2 = 0 + 10 Reorder the terms: -10 + 10 + 4x + x2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + 4x + x2 = 0 + 10 4x + x2 = 0 + 10 Combine like terms: 0 + 10 = 10 4x + x2 = 10 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = 10 + 4 Reorder the terms: 4 + 4x + x2 = 10 + 4 Combine like terms: 10 + 4 = 14 4 + 4x + x2 = 14 Factor a perfect square on the left side: (x + 2)(x + 2) = 14 Calculate the square root of the right side: 3.741657387 Break this problem into two subproblems by setting (x + 2) equal to 3.741657387 and -3.741657387.

Subproblem 1

x + 2 = 3.741657387 Simplifying x + 2 = 3.741657387 Reorder the terms: 2 + x = 3.741657387 Solving 2 + x = 3.741657387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 3.741657387 + -2 Combine like terms: 2 + -2 = 0 0 + x = 3.741657387 + -2 x = 3.741657387 + -2 Combine like terms: 3.741657387 + -2 = 1.741657387 x = 1.741657387 Simplifying x = 1.741657387

Subproblem 2

x + 2 = -3.741657387 Simplifying x + 2 = -3.741657387 Reorder the terms: 2 + x = -3.741657387 Solving 2 + x = -3.741657387 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -3.741657387 + -2 Combine like terms: 2 + -2 = 0 0 + x = -3.741657387 + -2 x = -3.741657387 + -2 Combine like terms: -3.741657387 + -2 = -5.741657387 x = -5.741657387 Simplifying x = -5.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.741657387, -5.741657387}

Solution

x = {1.741657387, -5.741657387}

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