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Simplifying x2 + -21x + 120 = 0 Reorder the terms: 120 + -21x + x2 = 0 Solving 120 + -21x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-120' to each side of the equation. 120 + -21x + -120 + x2 = 0 + -120 Reorder the terms: 120 + -120 + -21x + x2 = 0 + -120 Combine like terms: 120 + -120 = 0 0 + -21x + x2 = 0 + -120 -21x + x2 = 0 + -120 Combine like terms: 0 + -120 = -120 -21x + x2 = -120 The x term is -21x. Take half its coefficient (-10.5). Square it (110.25) and add it to both sides. Add '110.25' to each side of the equation. -21x + 110.25 + x2 = -120 + 110.25 Reorder the terms: 110.25 + -21x + x2 = -120 + 110.25 Combine like terms: -120 + 110.25 = -9.75 110.25 + -21x + x2 = -9.75 Factor a perfect square on the left side: (x + -10.5)(x + -10.5) = -9.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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