Which rational expression is equal to a positive whole number when evaluated?
2 ^1/2
8 ^1/3
12 ^1/4
15 ^1/5

B) 8^1/3

Step-by-step explanation:

It is B) 8 ^1/3

we can write 8 as 2^3

8^1/3 = (2^3)^1/3

= 2^3/3        [3/3 = 1]

= 2^1

= 2 which is a whole number.

B) 8^1/3

Hope this will helpful.

Thank you.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form