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Simplifying 7x(x + -1) = 28 Reorder the terms: 7x(-1 + x) = 28 (-1 * 7x + x * 7x) = 28 (-7x + 7x2) = 28 Solving -7x + 7x2 = 28 Solving for variable 'x'. Reorder the terms: -28 + -7x + 7x2 = 28 + -28 Combine like terms: 28 + -28 = 0 -28 + -7x + 7x2 = 0 Factor out the Greatest Common Factor (GCF), '7'. 7(-4 + -1x + x2) = 0 Ignore the factor 7.Subproblem 1
Set the factor '(-4 + -1x + x2)' equal to zero and attempt to solve: Simplifying -4 + -1x + x2 = 0 Solving -4 + -1x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '4' to each side of the equation. -4 + -1x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + -1x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1x + x2 = 0 + 4 -1x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 -1x + x2 = 4 The x term is -1x. Take half its coefficient (-0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. -1x + 0.25 + x2 = 4 + 0.25 Reorder the terms: 0.25 + -1x + x2 = 4 + 0.25 Combine like terms: 4 + 0.25 = 4.25 0.25 + -1x + x2 = 4.25 Factor a perfect square on the left side: (x + -0.5)(x + -0.5) = 4.25 Calculate the square root of the right side: 2.061552813 Break this problem into two subproblems by setting (x + -0.5) equal to 2.061552813 and -2.061552813.Subproblem 1
x + -0.5 = 2.061552813 Simplifying x + -0.5 = 2.061552813 Reorder the terms: -0.5 + x = 2.061552813 Solving -0.5 + x = 2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 2.061552813 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 2.061552813 + 0.5 x = 2.061552813 + 0.5 Combine like terms: 2.061552813 + 0.5 = 2.561552813 x = 2.561552813 Simplifying x = 2.561552813Subproblem 2
x + -0.5 = -2.061552813 Simplifying x + -0.5 = -2.061552813 Reorder the terms: -0.5 + x = -2.061552813 Solving -0.5 + x = -2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -2.061552813 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -2.061552813 + 0.5 x = -2.061552813 + 0.5 Combine like terms: -2.061552813 + 0.5 = -1.561552813 x = -1.561552813 Simplifying x = -1.561552813Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.561552813, -1.561552813}Solution
x = {2.561552813, -1.561552813}
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