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A construction site manager is using the quadratic equation 3x212x15=03x^2 - 12x - 15 = 0 to determine the placement of support pillars for a rectangular foundation. To solve this equation by completing the square, the manager first simplifies the equation to the form x24x=5x^2 - 4x = 5. To complete the square on the left side of the equation, what specific numerical value must be added to both sides?

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Updated 2026-04-17

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