Evaluate the expression when b=4 and x=-7.

-b+8x

-b+8x = 4+8(-7)
= 4+-56
= -52

-b+8x

-4 + 8(-7)

-4 + -56 = -60

To evaluate the expression -b+8x when b=4 and x=-7, follow these steps:

1. Replace b with its given value of 4 and x with its given value of -7 in the expression: -b+8x.

2. Calculate -b: -b = -(4) = -4.

3. Calculate 8x: 8x = 8(-7) = -56.

4. Substitute the calculated values back into the original expression: -b+8x = -4+(-56) = -4-56 = -60.

Therefore, when b=4 and x=-7, the expression -b+8x evaluates to -60.