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Simplifying x2 + -18x + -79 = -4 Reorder the terms: -79 + -18x + x2 = -4 Solving -79 + -18x + x2 = -4 Solving for variable 'x'. Reorder the terms: -79 + 4 + -18x + x2 = -4 + 4 Combine like terms: -79 + 4 = -75 -75 + -18x + x2 = -4 + 4 Combine like terms: -4 + 4 = 0 -75 + -18x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '75' to each side of the equation. -75 + -18x + 75 + x2 = 0 + 75 Reorder the terms: -75 + 75 + -18x + x2 = 0 + 75 Combine like terms: -75 + 75 = 0 0 + -18x + x2 = 0 + 75 -18x + x2 = 0 + 75 Combine like terms: 0 + 75 = 75 -18x + x2 = 75 The x term is -18x. Take half its coefficient (-9). Square it (81) and add it to both sides. Add '81' to each side of the equation. -18x + 81 + x2 = 75 + 81 Reorder the terms: 81 + -18x + x2 = 75 + 81 Combine like terms: 75 + 81 = 156 81 + -18x + x2 = 156 Factor a perfect square on the left side: (x + -9)(x + -9) = 156 Calculate the square root of the right side: 12.489995997 Break this problem into two subproblems by setting (x + -9) equal to 12.489995997 and -12.489995997.Subproblem 1
x + -9 = 12.489995997 Simplifying x + -9 = 12.489995997 Reorder the terms: -9 + x = 12.489995997 Solving -9 + x = 12.489995997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 12.489995997 + 9 Combine like terms: -9 + 9 = 0 0 + x = 12.489995997 + 9 x = 12.489995997 + 9 Combine like terms: 12.489995997 + 9 = 21.489995997 x = 21.489995997 Simplifying x = 21.489995997Subproblem 2
x + -9 = -12.489995997 Simplifying x + -9 = -12.489995997 Reorder the terms: -9 + x = -12.489995997 Solving -9 + x = -12.489995997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -12.489995997 + 9 Combine like terms: -9 + 9 = 0 0 + x = -12.489995997 + 9 x = -12.489995997 + 9 Combine like terms: -12.489995997 + 9 = -3.489995997 x = -3.489995997 Simplifying x = -3.489995997Solution
The solution to the problem is based on the solutions from the subproblems. x = {21.489995997, -3.489995997}
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