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Simplifying 3y2 + 12y + -21 = 0 Reorder the terms: -21 + 12y + 3y2 = 0 Solving -21 + 12y + 3y2 = 0 Solving for variable 'y'. Factor out the Greatest Common Factor (GCF), '3'. 3(-7 + 4y + y2) = 0 Ignore the factor 3.Subproblem 1
Set the factor '(-7 + 4y + y2)' equal to zero and attempt to solve: Simplifying -7 + 4y + y2 = 0 Solving -7 + 4y + y2 = 0 Begin completing the square. Move the constant term to the right: Add '7' to each side of the equation. -7 + 4y + 7 + y2 = 0 + 7 Reorder the terms: -7 + 7 + 4y + y2 = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 4y + y2 = 0 + 7 4y + y2 = 0 + 7 Combine like terms: 0 + 7 = 7 4y + y2 = 7 The y term is 4y. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4y + 4 + y2 = 7 + 4 Reorder the terms: 4 + 4y + y2 = 7 + 4 Combine like terms: 7 + 4 = 11 4 + 4y + y2 = 11 Factor a perfect square on the left side: (y + 2)(y + 2) = 11 Calculate the square root of the right side: 3.31662479 Break this problem into two subproblems by setting (y + 2) equal to 3.31662479 and -3.31662479.Subproblem 1
y + 2 = 3.31662479 Simplifying y + 2 = 3.31662479 Reorder the terms: 2 + y = 3.31662479 Solving 2 + y = 3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 3.31662479 + -2 Combine like terms: 2 + -2 = 0 0 + y = 3.31662479 + -2 y = 3.31662479 + -2 Combine like terms: 3.31662479 + -2 = 1.31662479 y = 1.31662479 Simplifying y = 1.31662479Subproblem 2
y + 2 = -3.31662479 Simplifying y + 2 = -3.31662479 Reorder the terms: 2 + y = -3.31662479 Solving 2 + y = -3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -3.31662479 + -2 Combine like terms: 2 + -2 = 0 0 + y = -3.31662479 + -2 y = -3.31662479 + -2 Combine like terms: -3.31662479 + -2 = -5.31662479 y = -5.31662479 Simplifying y = -5.31662479Solution
The solution to the problem is based on the solutions from the subproblems. y = {1.31662479, -5.31662479}Solution
y = {1.31662479, -5.31662479}
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