Question

Evaluate the expression

15x+4 for x=− 1/2
​
.
A. −5.5
B. −4.5
C. 5.5
D. 4.5

Answer 1

The expression 15x + 4 evaluates to -3.5 when x = -1/2. However, this result is not listed among the provided options, indicating a possible mistake in the question or answers.

Step-by-step explanation:

To evaluate the expression 15x + 4 for x = -1/2, you substitute -1/2 in place of x. The calculation steps are as follows:

1. Substitute x with -1/2: 15(-1/2) + 4.
2. Multiply 15 by -1/2: (-15/2) + 4.
3. Convert 4 to have the same denominator as -15/2, which is 2: (-15/2) + (4 * 2/2).
4. Now add the fractions: (-15/2) + (8/2).
5. The result is (-15 + 8)/2 which simplifies to -7/2.
6. Finally, convert -7/2 into a decimal: -3.5.

Therefore, 15x + 4 evaluates to -3.5 when x = -1/2, which is not one of the provided options A. -5.5, B. -4.5, C. 5.5, or D. 4.5.