If x=2, y= -5, and z= -1, then what does (x-y) (x+y-z) equal?

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Answer 1 · 2018-04-19T07:12:45

$(x-y)(x+y-z) = (2+5)xx(2-5+1) = 7xx (-2) = -14$

First, substitute the values of $x$ , $y$ , and $z$ .

$(x-y)(x+y-z) = [2- (-5)][2+ (-5) - (-1)]$

Next, we remove unnecessary addition and subtraction signs to complete the expression.

$- and + = -$

$- and - = +$

$+ and + = +$

So

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

Next, we complete the expressions inside the brackets (order of operations).

$(7)xx(-2)$

Finally, to complete the expression, we carry out the multiplication:

$-14$