Question

The volume of cuboid is given by the
expression x3+2x2-x-2. The dimension of
the cuboid for x = 5 is:​

Answer 1

For finding the volume of the given cuboid ; we just need to substitute the value of x in the given polynomial and then simplify it.

Here the value of (x) is already given as 5 . We will now just substitute and simplify.

➜ p(x) = x³ + 2x² - x - 2

➜ p(5) = (5)³ + 2(5)² - (5) - 2

➜ p(5) = 125 + 2(25) - (5) - 2

➜ p(5) = 125 + 50 - 5 - 2

➜ p(5) = 175 - 5 - 2

➜ p(5) = 170 - 2

➜ p(5) = 168 cm³

So the volume of the cube with dimension of (x = 5) is 168cm³.

Answer 2

Step-by-step explanation:

The volume of cuboid is given by the

expression x³ + 2x² - x - 2.

Given polynomial is x³ + 2x² - x - 2 and value of x is 5.

Simply substitute the value of x in x³ + 2x² - x - 2.

→ p(x) = x³ + 2x² - x - 2

→ p(5) = (5)³ + 2(5)² - (5) - 2

→ p(5) = 125 + 2(25) - (5) - 2

→ p(5) = 125 + 50 - 5 - 2

→ p(5) = 175 - (5 + 2)

→ p(5) = 175 - 7

→ p(5) = 168

Hence, the value of x³ + 2x² - x - 2 is 168 when x is 5.