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Simplifying 7x(6 + -2x) = 3 (6 * 7x + -2x * 7x) = 3 (42x + -14x2) = 3 Solving 42x + -14x2 = 3 Solving for variable 'x'. Reorder the terms: -3 + 42x + -14x2 = 3 + -3 Combine like terms: 3 + -3 = 0 -3 + 42x + -14x2 = 0 Begin completing the square. Divide all terms by -14 the coefficient of the squared term: Divide each side by '-14'. 0.2142857143 + -3x + x2 = 0 Move the constant term to the right: Add '-0.2142857143' to each side of the equation. 0.2142857143 + -3x + -0.2142857143 + x2 = 0 + -0.2142857143 Reorder the terms: 0.2142857143 + -0.2142857143 + -3x + x2 = 0 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + -3x + x2 = 0 + -0.2142857143 -3x + x2 = 0 + -0.2142857143 Combine like terms: 0 + -0.2142857143 = -0.2142857143 -3x + x2 = -0.2142857143 The x term is -3x. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3x + 2.25 + x2 = -0.2142857143 + 2.25 Reorder the terms: 2.25 + -3x + x2 = -0.2142857143 + 2.25 Combine like terms: -0.2142857143 + 2.25 = 2.0357142857 2.25 + -3x + x2 = 2.0357142857 Factor a perfect square on the left side: (x + -1.5)(x + -1.5) = 2.0357142857 Calculate the square root of the right side: 1.426784597 Break this problem into two subproblems by setting (x + -1.5) equal to 1.426784597 and -1.426784597.Subproblem 1
x + -1.5 = 1.426784597 Simplifying x + -1.5 = 1.426784597 Reorder the terms: -1.5 + x = 1.426784597 Solving -1.5 + x = 1.426784597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.426784597 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.426784597 + 1.5 x = 1.426784597 + 1.5 Combine like terms: 1.426784597 + 1.5 = 2.926784597 x = 2.926784597 Simplifying x = 2.926784597Subproblem 2
x + -1.5 = -1.426784597 Simplifying x + -1.5 = -1.426784597 Reorder the terms: -1.5 + x = -1.426784597 Solving -1.5 + x = -1.426784597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.426784597 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.426784597 + 1.5 x = -1.426784597 + 1.5 Combine like terms: -1.426784597 + 1.5 = 0.073215403 x = 0.073215403 Simplifying x = 0.073215403Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.926784597, 0.073215403}
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