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Simplifying X2 + -10X + 800 = 0 Reorder the terms: 800 + -10X + X2 = 0 Solving 800 + -10X + X2 = 0 Solving for variable 'X'. Begin completing the square. Move the constant term to the right: Add '-800' to each side of the equation. 800 + -10X + -800 + X2 = 0 + -800 Reorder the terms: 800 + -800 + -10X + X2 = 0 + -800 Combine like terms: 800 + -800 = 0 0 + -10X + X2 = 0 + -800 -10X + X2 = 0 + -800 Combine like terms: 0 + -800 = -800 -10X + X2 = -800 The X term is -10X. Take half its coefficient (-5). Square it (25) and add it to both sides. Add '25' to each side of the equation. -10X + 25 + X2 = -800 + 25 Reorder the terms: 25 + -10X + X2 = -800 + 25 Combine like terms: -800 + 25 = -775 25 + -10X + X2 = -775 Factor a perfect square on the left side: (X + -5)(X + -5) = -775 Can't calculate square root of the right side. The solution to this equation could not be determined.
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