Evaluate 5x3 + 2 for x = -1.
A)-7
B)-3
C)4
D)6
5x3?!
We'll be glad to check your answer.
-7
To evaluate the expression 5x3 + 2 for x = -1, you need to substitute the value of x with -1 in the expression and perform the arithmetic calculations:
5(-1)^3 + 2
First, calculate (-1)^3, which means raising -1 to the power of 3:
(-1)^3 = -1 x -1 x -1 = -1
Now substitute this value back into the expression:
5(-1)^3 + 2 = 5(-1) + 2 = -5 + 2 = -3
So the answer is -3.
Therefore, the correct answer is B) -3.