Question

-4|x+5y| for x=7 and y=-3

Answer 1

the answer is negatif 32

Answer 2

First of all, let's plug the values. You simply have to substitute every occurrence of "x" with "7" and every occurrence of "y" with "-3", which leads to

`-4|x+5y| \to -4|7+5\cdot (-3)| = -4|7-15| = -4|-8|`

Now, the absolute value of a number
`x`, i.e.
`|x|`, returns the positive versione of a number. So, if x is positive, you have
`|x| = x` whereas if x is negative you have
`|x| = -x`.

In this case, the absolute value of -8 is 8, because -8 is negative. So, the expression becomes

`-4|-8| = -4 \cdot 8 = -32`