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Simplifying 4x2 + 40x + 280 = 0 Reorder the terms: 280 + 40x + 4x2 = 0 Solving 280 + 40x + 4x2 = 0 Solving for variable 'x'. Factor out the Greatest Common Factor (GCF), '4'. 4(70 + 10x + x2) = 0 Ignore the factor 4.Subproblem 1
Set the factor '(70 + 10x + x2)' equal to zero and attempt to solve: Simplifying 70 + 10x + x2 = 0 Solving 70 + 10x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-70' to each side of the equation. 70 + 10x + -70 + x2 = 0 + -70 Reorder the terms: 70 + -70 + 10x + x2 = 0 + -70 Combine like terms: 70 + -70 = 0 0 + 10x + x2 = 0 + -70 10x + x2 = 0 + -70 Combine like terms: 0 + -70 = -70 10x + x2 = -70 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 = -70 + 25 Reorder the terms: 25 + 10x + x2 = -70 + 25 Combine like terms: -70 + 25 = -45 25 + 10x + x2 = -45 Factor a perfect square on the left side: (x + 5)(x + 5) = -45 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.
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