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Simplifying 6x2 + 4x = 21 Reorder the terms: 4x + 6x2 = 21 Solving 4x + 6x2 = 21 Solving for variable 'x'. Reorder the terms: -21 + 4x + 6x2 = 21 + -21 Combine like terms: 21 + -21 = 0 -21 + 4x + 6x2 = 0 Begin completing the square. Divide all terms by 6 the coefficient of the squared term: Divide each side by '6'. -3.5 + 0.6666666667x + x2 = 0 Move the constant term to the right: Add '3.5' to each side of the equation. -3.5 + 0.6666666667x + 3.5 + x2 = 0 + 3.5 Reorder the terms: -3.5 + 3.5 + 0.6666666667x + x2 = 0 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + 0.6666666667x + x2 = 0 + 3.5 0.6666666667x + x2 = 0 + 3.5 Combine like terms: 0 + 3.5 = 3.5 0.6666666667x + x2 = 3.5 The x term is 0.6666666667x. Take half its coefficient (0.3333333334). Square it (0.1111111112) and add it to both sides. Add '0.1111111112' to each side of the equation. 0.6666666667x + 0.1111111112 + x2 = 3.5 + 0.1111111112 Reorder the terms: 0.1111111112 + 0.6666666667x + x2 = 3.5 + 0.1111111112 Combine like terms: 3.5 + 0.1111111112 = 3.6111111112 0.1111111112 + 0.6666666667x + x2 = 3.6111111112 Factor a perfect square on the left side: (x + 0.3333333334)(x + 0.3333333334) = 3.6111111112 Calculate the square root of the right side: 1.900292375 Break this problem into two subproblems by setting (x + 0.3333333334) equal to 1.900292375 and -1.900292375.Subproblem 1
x + 0.3333333334 = 1.900292375 Simplifying x + 0.3333333334 = 1.900292375 Reorder the terms: 0.3333333334 + x = 1.900292375 Solving 0.3333333334 + x = 1.900292375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 1.900292375 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 1.900292375 + -0.3333333334 x = 1.900292375 + -0.3333333334 Combine like terms: 1.900292375 + -0.3333333334 = 1.5669590416 x = 1.5669590416 Simplifying x = 1.5669590416Subproblem 2
x + 0.3333333334 = -1.900292375 Simplifying x + 0.3333333334 = -1.900292375 Reorder the terms: 0.3333333334 + x = -1.900292375 Solving 0.3333333334 + x = -1.900292375 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -1.900292375 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -1.900292375 + -0.3333333334 x = -1.900292375 + -0.3333333334 Combine like terms: -1.900292375 + -0.3333333334 = -2.2336257084 x = -2.2336257084 Simplifying x = -2.2336257084Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.5669590416, -2.2336257084}
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