Question

what is the value of 2a3 - a, when a = 4?

Answer 1

Answer:

20

step-by-step:

=2(4)3-4

=2(4)×3-4

=2(12)-4

=2×(12)-4

=24-4

=20 (answer)

Answer 2

The value of 2a³ - a = 124 when a = 4

Given :

The expression 2a³ - a

To find :

The value of the expression when a = 4

Solution :

Step 1 of 2 :

Write down the given expression

The given expression is

2a³ - a

Step 2 of 2 :

Find the required value of the expression

When a = 4 we have

$\sf 2 {a}^{3} - a$

$\sf = 2 \times {4}^{3} - 4$

$\sf = 2 \times 64 - 4$

$\sf = 128 - 4$

$\sf = 124$

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