X= 2; 7x^3 + 4

just put a 2 in for every x:

7*2^3 + 4 = 7*8 + 4 = ...

7*2^3+4 = 7*8+4 = 56+4 = 60

To evaluate the expression 7x^3 + 4, substitute the value of x into the expression.

Given that x = 2, substitute this value into the expression:

7(2)^3 + 4

First, calculate 2^3:

2^3 = 2 * 2 * 2 = 8

Then, replace (2^3) in the expression:

7(8) + 4

Multiply 7 and 8:

7 * 8 = 56

Finally, add 56 and 4:

56 + 4 = 60

Therefore, 7x^3 + 4, when x = 2, is equal to 60.