a number multiplied by -8, subtracted from the sum of 15 and five times the number

Question

x(-8)-(15+5)x

 

Answer 1

 

You were close - the only thing you missed was putting the x on the outside of the parenthesis.  That would have been multiplying both the 15 and the 5 by 'a number'.

(15+5x) - (-8x)

 

(15 + 5x) + 8x (2 negatives make a positive)

(15 + 13x) (combine like terms)

It's not an equation because there is no equal sign, so it stays at 15 + 13x

Answer 2

A number multiplied by -8 is -8n

Sum of 15 and five times the number is 15 + 5n

 

The first is to be "subtracted from" the second.

 

15 + 5n - [-8n]