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Simplifying x2 + -8x + 90 = 0 Reorder the terms: 90 + -8x + x2 = 0 Solving 90 + -8x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-90' to each side of the equation. 90 + -8x + -90 + x2 = 0 + -90 Reorder the terms: 90 + -90 + -8x + x2 = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -8x + x2 = 0 + -90 -8x + x2 = 0 + -90 Combine like terms: 0 + -90 = -90 -8x + x2 = -90 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = -90 + 16 Reorder the terms: 16 + -8x + x2 = -90 + 16 Combine like terms: -90 + 16 = -74 16 + -8x + x2 = -74 Factor a perfect square on the left side: (x + -4)(x + -4) = -74 Can't calculate square root of the right side. The solution to this equation could not be determined.
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