Question

$2a { }^{2} b - b {}^{3} - a {}^{3 } + 3a {}^{2} b {}^{2} if a = - 1 and b = - 2$
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Answer 1

Answer:

17

Step-by-step explanation:

• 2a²b - b³ - a³ + 3a²b² ; a = -1 , b = -2
• 2×(-1)²×(-2) - (-2)³ - (-1)³ + 3×(-1)²×(-2)²
• 2×1×(-2) - (-8) - (-1) + 3×1×4
• -4 + 8 + 1 + 12
• 17