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Simplifying r4 + 3r2 + 4 = 0 Reorder the terms: 4 + 3r2 + r4 = 0 Solving 4 + 3r2 + r4 = 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 + 3r2 + -4 + r4 = 0 + -4 Reorder the terms: 4 + -4 + 3r2 + r4 = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 3r2 + r4 = 0 + -4 3r2 + r4 = 0 + -4 Combine like terms: 0 + -4 = -4 3r2 + r4 = -4 The r term is 3r2. Take half its coefficient (1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. 3r2 + 2.25 + r4 = -4 + 2.25 Reorder the terms: 2.25 + 3r2 + r4 = -4 + 2.25 Combine like terms: -4 + 2.25 = -1.75 2.25 + 3r2 + r4 = -1.75 Factor a perfect square on the left side: (r2 + 1.5)(r2 + 1.5) = -1.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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