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.