a) S = 6a²
a = x - 5
S = 6(x - 5)² = 6(x² - 10x + 25) = 6x² - 60x + 150
S = 6x² - 60x + 150
б) V = a³
V = (x - 5)³ = x³ - 3 * x² * 5 + 3 * x * 5² - 5³ = x³ - 15x² + 75x - 125
V = x³ - 15x² + 75x - 125
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Verified answer
a) S = 6a²
a = x - 5
S = 6(x - 5)² = 6(x² - 10x + 25) = 6x² - 60x + 150
S = 6x² - 60x + 150
б) V = a³
a = x - 5
V = (x - 5)³ = x³ - 3 * x² * 5 + 3 * x * 5² - 5³ = x³ - 15x² + 75x - 125
V = x³ - 15x² + 75x - 125