1) S = 6a²
a = 5x - 2
S = 6 * (5x - 2)² = 6 * (25x² - 20x + 4) = 150x² - 120x + 24
S = 150x² - 120x + 24
2) V = a³
V = (5x - 2)³ = (5x)³ - 3 * (5x)² * 2 + 3 * 5x * 2² - 2³ = 125x³ - 150x² + 60x - 8
V = 125x³ - 150x² + 60x - 8
1) S = 6a²
a = 5x - 2
S = 6 * (5x - 2)² = 6 * (25x² - 20x + 4) = 150x² - 120x + 24
S = 150x² - 120x + 24
2) V = a³
a = 5x - 2
V = (5x - 2)³ = (5x)³ - 3 * (5x)² * 2 + 3 * 5x * 2² - 2³ = 125x³ - 150x² + 60x - 8
V = 125x³ - 150x² + 60x - 8