Question

Use the cubic model y = 6x3 - 5x2 + 4x – 3 to estimate the value of y when x = 2.

a 25
(b 33
c 48
d 79
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Answer 1

The answer is B.

Explanation:

You have to substitute x = 2, into the equation of y :

`y = 6 {x}^(3) - 5 {x}^(2) + 4x - 3`

`let \: x = 2`

`y = 6 {( 2)}^(3) - 5 {(2)}^(2) + 4(2) - 3`

`y = 48 - 20 + 8 - 3`

`y = 33`