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Simplifying (9(r2)) + -1(5r) + -10 = 0 Remove parenthesis around (5r) (9r2) + -1 * 5r + -10 = 0 Multiply -1 * 5 (9r2) + -5r + -10 = 0 Reorder the terms: -10 + -5r + (9r2) = 0 Solving -10 + -5r + (9r2) = 0 Solving for variable 'r'. Begin completing the square. Divide all terms by 9 the coefficient of the squared term: Divide each side by '9'. -1.111111111 + -0.5555555556r + r2 = 0 Move the constant term to the right: Add '1.111111111' to each side of the equation. -1.111111111 + -0.5555555556r + 1.111111111 + r2 = 0 + 1.111111111 Reorder the terms: -1.111111111 + 1.111111111 + -0.5555555556r + r2 = 0 + 1.111111111 Combine like terms: -1.111111111 + 1.111111111 = 0.000000000 0.000000000 + -0.5555555556r + r2 = 0 + 1.111111111 -0.5555555556r + r2 = 0 + 1.111111111 Combine like terms: 0 + 1.111111111 = 1.111111111 -0.5555555556r + r2 = 1.111111111 The r term is -0.5555555556r. Take half its coefficient (-0.2777777778). Square it (0.07716049384) and add it to both sides. Add '0.07716049384' to each side of the equation. -0.5555555556r + 0.07716049384 + r2 = 1.111111111 + 0.07716049384 Reorder the terms: 0.07716049384 + -0.5555555556r + r2 = 1.111111111 + 0.07716049384 Combine like terms: 1.111111111 + 0.07716049384 = 1.18827160484 0.07716049384 + -0.5555555556r + r2 = 1.18827160484 Factor a perfect square on the left side: ((r) + -0.2777777778)((r) + -0.2777777778) = 1.18827160484 Calculate the square root of the right side: 1.090078715 Break this problem into two subproblems by setting ((r) + -0.2777777778) equal to 1.090078715 and -1.090078715.Subproblem 1
(r) + -0.2777777778 = 1.090078715 Simplifying (r) + -0.2777777778 = 1.090078715 r + -0.2777777778 = 1.090078715 Reorder the terms: -0.2777777778 + r = 1.090078715 Solving -0.2777777778 + r = 1.090078715 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + r = 1.090078715 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + r = 1.090078715 + 0.2777777778 r = 1.090078715 + 0.2777777778 Combine like terms: 1.090078715 + 0.2777777778 = 1.3678564928 r = 1.3678564928 Simplifying r = 1.3678564928Subproblem 2
(r) + -0.2777777778 = -1.090078715 Simplifying (r) + -0.2777777778 = -1.090078715 r + -0.2777777778 = -1.090078715 Reorder the terms: -0.2777777778 + r = -1.090078715 Solving -0.2777777778 + r = -1.090078715 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '0.2777777778' to each side of the equation. -0.2777777778 + 0.2777777778 + r = -1.090078715 + 0.2777777778 Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000 0.0000000000 + r = -1.090078715 + 0.2777777778 r = -1.090078715 + 0.2777777778 Combine like terms: -1.090078715 + 0.2777777778 = -0.8123009372 r = -0.8123009372 Simplifying r = -0.8123009372Solution
The solution to the problem is based on the solutions from the subproblems. r = {1.3678564928, -0.8123009372}
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