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Simplifying r2 + 2r + -4 = 0 Reorder the terms: -4 + 2r + r2 = 0 Solving -4 + 2r + r2 = 0 Solving for variable 'r'. Begin completing the square. Move the constant term to the right: Add '4' to each side of the equation. -4 + 2r + 4 + r2 = 0 + 4 Reorder the terms: -4 + 4 + 2r + r2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 2r + r2 = 0 + 4 2r + r2 = 0 + 4 Combine like terms: 0 + 4 = 4 2r + r2 = 4 The r term is 2r. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2r + 1 + r2 = 4 + 1 Reorder the terms: 1 + 2r + r2 = 4 + 1 Combine like terms: 4 + 1 = 5 1 + 2r + r2 = 5 Factor a perfect square on the left side: (r + 1)(r + 1) = 5 Calculate the square root of the right side: 2.236067978 Break this problem into two subproblems by setting (r + 1) equal to 2.236067978 and -2.236067978.Subproblem 1
r + 1 = 2.236067978 Simplifying r + 1 = 2.236067978 Reorder the terms: 1 + r = 2.236067978 Solving 1 + r = 2.236067978 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + r = 2.236067978 + -1 Combine like terms: 1 + -1 = 0 0 + r = 2.236067978 + -1 r = 2.236067978 + -1 Combine like terms: 2.236067978 + -1 = 1.236067978 r = 1.236067978 Simplifying r = 1.236067978Subproblem 2
r + 1 = -2.236067978 Simplifying r + 1 = -2.236067978 Reorder the terms: 1 + r = -2.236067978 Solving 1 + r = -2.236067978 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + r = -2.236067978 + -1 Combine like terms: 1 + -1 = 0 0 + r = -2.236067978 + -1 r = -2.236067978 + -1 Combine like terms: -2.236067978 + -1 = -3.236067978 r = -3.236067978 Simplifying r = -3.236067978Solution
The solution to the problem is based on the solutions from the subproblems. r = {1.236067978, -3.236067978}
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