xLilic
Answered

What is the value of the expression when a = 3 and b = 2?


3a^3 + 2b^3

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A78
B97
C135
D745

Please don't respond with the answer alone, I'd like to know how to work through it. :)

Verified Answer :

3a³ + 2b³ = ?

Substitute for values:

3a³ + 2b³
a = 3
3 × 3³ + 2b³

b = 2
3a³ + 2 × 2³

Full question:

3 × 3³ + 2 × 2³

3 × 3³ + 2 × 2³
3 × 27 + 2 × 2³
3 × 27 + 2 × 8
81 + 16
97

The value of the expression 3a³ + 2b³ when a = 3 and b = 2 is 97.

3 × 3³ + 2 × 2³ = 97

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