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Simplifying X2 + 2.2X + 21 = 0 Reorder the terms: 21 + 2.2X + X2 = 0 Solving 21 + 2.2X + X2 = 0 Solving for variable 'X'. Begin completing the square. Move the constant term to the right: Add '-21' to each side of the equation. 21 + 2.2X + -21 + X2 = 0 + -21 Reorder the terms: 21 + -21 + 2.2X + X2 = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 2.2X + X2 = 0 + -21 2.2X + X2 = 0 + -21 Combine like terms: 0 + -21 = -21 2.2X + X2 = -21 The X term is 2.2X. Take half its coefficient (1.1). Square it (1.21) and add it to both sides. Add '1.21' to each side of the equation. 2.2X + 1.21 + X2 = -21 + 1.21 Reorder the terms: 1.21 + 2.2X + X2 = -21 + 1.21 Combine like terms: -21 + 1.21 = -19.79 1.21 + 2.2X + X2 = -19.79 Factor a perfect square on the left side: (X + 1.1)(X + 1.1) = -19.79 Can't calculate square root of the right side. The solution to this equation could not be determined.
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