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= 8a^6 b^9
b. (2t + 3)³
= 8t³ + 3 (2t)² . 3 + 3 . 2t . 3² + 3³
= 8t³ + 3 . 4t² . 3 + 6t . 9 + 27
= 8t³ + 36t² + 54t + 27
c. (a + 2b - 5)²
= a² + (2b)² + (-5)² + 2 . 2ab - 2 . 5a - 2 . 10b
= a² + 4b² + 25 + 4ab - 10a - 20b
d. (x - 2y)^4
= x^4 - 4 x³ (-2y) + 6 x² (-2y)² - 4x (-2y)³ + (-2y)^4
= x^4 - 8 x³y + 6 x² (4y)² - 4x (-8y³) + 16y^4
= x^4 - 8x³y + 6 x² (16y²) - 32 xy³ + 16y^4
= x^4 - 8x³y + 96x²y² - 32xy³ + 16y^4