7) 25a¹⁵c⁵x : (-5a¹⁰c³) = -5a¹⁵⁻¹⁰c⁵⁻³x = - 5 a⁵c²x
8) 36y⁴z⁸ = (6y²z⁴)²
9) P(1;-2) = - 2 * 1² - 4 * 1 * (-2) + 3 * (- 2)² = - 2 + 8 + 12 = 18
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7) 25a¹⁵c⁵x : (-5a¹⁰c³) = -5a¹⁵⁻¹⁰c⁵⁻³x = - 5 a⁵c²x
8) 36y⁴z⁸ = (6y²z⁴)²
9) P(1;-2) = - 2 * 1² - 4 * 1 * (-2) + 3 * (- 2)² = - 2 + 8 + 12 = 18