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Simplifying 4x4 + -9x2 + 20 = 0 Reorder the terms: 20 + -9x2 + 4x4 = 0 Solving 20 + -9x2 + 4x4 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 5 + -2.25x2 + x4 = 0 Move the constant term to the right: Add '-5' to each side of the equation. 5 + -2.25x2 + -5 + x4 = 0 + -5 Reorder the terms: 5 + -5 + -2.25x2 + x4 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2.25x2 + x4 = 0 + -5 -2.25x2 + x4 = 0 + -5 Combine like terms: 0 + -5 = -5 -2.25x2 + x4 = -5 The x term is -2.25x2. Take half its coefficient (-1.125). Square it (1.265625) and add it to both sides. Add '1.265625' to each side of the equation. -2.25x2 + 1.265625 + x4 = -5 + 1.265625 Reorder the terms: 1.265625 + -2.25x2 + x4 = -5 + 1.265625 Combine like terms: -5 + 1.265625 = -3.734375 1.265625 + -2.25x2 + x4 = -3.734375 Factor a perfect square on the left side: (x2 + -1.125)(x2 + -1.125) = -3.734375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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