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Simplifying 9r2 + 6r = 1 Reorder the terms: 6r + 9r2 = 1 Solving 6r + 9r2 = 1 Solving for variable 'r'. Reorder the terms: -1 + 6r + 9r2 = 1 + -1 Combine like terms: 1 + -1 = 0 -1 + 6r + 9r2 = 0 Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. -0.1111111111 + 0.6666666667r + r2 = 0 Move the constant term to the right: Add '0.1111111111' to each side of the equation. -0.1111111111 + 0.6666666667r + 0.1111111111 + r2 = 0 + 0.1111111111 Reorder the terms: -0.1111111111 + 0.1111111111 + 0.6666666667r + r2 = 0 + 0.1111111111 Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000 0.0000000000 + 0.6666666667r + r2 = 0 + 0.1111111111 0.6666666667r + r2 = 0 + 0.1111111111 Combine like terms: 0 + 0.1111111111 = 0.1111111111 0.6666666667r + r2 = 0.1111111111 The r term is 0.6666666667r. 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. 0.6666666667r + 0.1111111112 + r2 = 0.1111111111 + 0.1111111112 Reorder the terms: 0.1111111112 + 0.6666666667r + r2 = 0.1111111111 + 0.1111111112 Combine like terms: 0.1111111111 + 0.1111111112 = 0.2222222223 0.1111111112 + 0.6666666667r + r2 = 0.2222222223 Factor a perfect square on the left side: (r + 0.3333333334)(r + 0.3333333334) = 0.2222222223 Calculate the square root of the right side: 0.471404521 Break this problem into two subproblems by setting (r + 0.3333333334) equal to 0.471404521 and -0.471404521.Subproblem 1
r + 0.3333333334 = 0.471404521 Simplifying r + 0.3333333334 = 0.471404521 Reorder the terms: 0.3333333334 + r = 0.471404521 Solving 0.3333333334 + r = 0.471404521 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + r = 0.471404521 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + r = 0.471404521 + -0.3333333334 r = 0.471404521 + -0.3333333334 Combine like terms: 0.471404521 + -0.3333333334 = 0.1380711876 r = 0.1380711876 Simplifying r = 0.1380711876Subproblem 2
r + 0.3333333334 = -0.471404521 Simplifying r + 0.3333333334 = -0.471404521 Reorder the terms: 0.3333333334 + r = -0.471404521 Solving 0.3333333334 + r = -0.471404521 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + r = -0.471404521 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + r = -0.471404521 + -0.3333333334 r = -0.471404521 + -0.3333333334 Combine like terms: -0.471404521 + -0.3333333334 = -0.8047378544 r = -0.8047378544 Simplifying r = -0.8047378544Solution
The solution to the problem is based on the solutions from the subproblems. r = {0.1380711876, -0.8047378544}
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