Question

And evaluate x(- y + z) for x=-1 y=-2 and z=5

Answer 1

Put the values of x, y and z to the expression.

$(-1)(-(-2)+5)=(-1)(2+5)=(-1)(7)=-7$

Used PEMDAS:

P Parentheses first

E Exponents (ie Powers and Square Roots, etc.)

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

Answer 2

Multiply x to (-y) then x to (z)
mean x(-y)+ x(z)
plug in the variable given
(-1)(-(-2)+5)
-2-5=-7