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Simplifying (5x + -4)(5x + 4) = 25x2 + -16 Reorder the terms: (-4 + 5x)(5x + 4) = 25x2 + -16 Reorder the terms: (-4 + 5x)(4 + 5x) = 25x2 + -16 Multiply (-4 + 5x) * (4 + 5x) (-4(4 + 5x) + 5x * (4 + 5x)) = 25x2 + -16 ((4 * -4 + 5x * -4) + 5x * (4 + 5x)) = 25x2 + -16 ((-16 + -20x) + 5x * (4 + 5x)) = 25x2 + -16 (-16 + -20x + (4 * 5x + 5x * 5x)) = 25x2 + -16 (-16 + -20x + (20x + 25x2)) = 25x2 + -16 Combine like terms: -20x + 20x = 0 (-16 + 0 + 25x2) = 25x2 + -16 (-16 + 25x2) = 25x2 + -16 Reorder the terms: -16 + 25x2 = -16 + 25x2 Add '16' to each side of the equation. -16 + 16 + 25x2 = -16 + 16 + 25x2 Combine like terms: -16 + 16 = 0 0 + 25x2 = -16 + 16 + 25x2 25x2 = -16 + 16 + 25x2 Combine like terms: -16 + 16 = 0 25x2 = 0 + 25x2 25x2 = 25x2 Add '-25x2' to each side of the equation. 25x2 + -25x2 = 25x2 + -25x2 Combine like terms: 25x2 + -25x2 = 0 0 = 25x2 + -25x2 Combine like terms: 25x2 + -25x2 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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