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Simplifying (r2 + r + -1)(r2 + 5r + -7) = 0 Reorder the terms: (-1 + r + r2)(r2 + 5r + -7) = 0 Reorder the terms: (-1 + r + r2)(-7 + 5r + r2) = 0 Multiply (-1 + r + r2) * (-7 + 5r + r2) (-1(-7 + 5r + r2) + r(-7 + 5r + r2) + r2(-7 + 5r + r2)) = 0 ((-7 * -1 + 5r * -1 + r2 * -1) + r(-7 + 5r + r2) + r2(-7 + 5r + r2)) = 0 ((7 + -5r + -1r2) + r(-7 + 5r + r2) + r2(-7 + 5r + r2)) = 0 (7 + -5r + -1r2 + (-7 * r + 5r * r + r2 * r) + r2(-7 + 5r + r2)) = 0 (7 + -5r + -1r2 + (-7r + 5r2 + r3) + r2(-7 + 5r + r2)) = 0 (7 + -5r + -1r2 + -7r + 5r2 + r3 + (-7 * r2 + 5r * r2 + r2 * r2)) = 0 (7 + -5r + -1r2 + -7r + 5r2 + r3 + (-7r2 + 5r3 + r4)) = 0 Reorder the terms: (7 + -5r + -7r + -1r2 + 5r2 + -7r2 + r3 + 5r3 + r4) = 0 Combine like terms: -5r + -7r = -12r (7 + -12r + -1r2 + 5r2 + -7r2 + r3 + 5r3 + r4) = 0 Combine like terms: -1r2 + 5r2 = 4r2 (7 + -12r + 4r2 + -7r2 + r3 + 5r3 + r4) = 0 Combine like terms: 4r2 + -7r2 = -3r2 (7 + -12r + -3r2 + r3 + 5r3 + r4) = 0 Combine like terms: r3 + 5r3 = 6r3 (7 + -12r + -3r2 + 6r3 + r4) = 0 Solving 7 + -12r + -3r2 + 6r3 + r4 = 0 Solving for variable 'r'. The solution to this equation could not be determined.
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