Question

Evaluate each expression.

A. y^4  for y= 2

B. (2a)^4  for a= 5 

C. x^3 + 5 for  x= 3 

D. 3a^2  for a=2 

 

Answer 1

• A. y⁴ for y = 2.

Substitute y = 2 in y⁴ .

= 2⁴

= 2 * 2 * 2 * 2

= 16.

• B. (2a)⁴ for a = 5.

Substitute a = 5 in (2a)⁴ .

= (2 * 5)⁴

= (10)⁴

= 10 * 10 * 10 *10

= 10000.

• C. x³ + 5 for x = 3.

Substitute x = 3 in x³ + 5.

= 3³ + 5

= 3 * 3 * 3 + 5

= 27 + 5

= 32.

• D.3a² for a = 2.

Substitute a = 2 in 3a² .

= 3 * 2²

= 3 * ( 2 * 2)

= 3 * 4

= 12.