Question

if x=1and y= -2 the value of(x+y)(-x-y) plzz answer with working​

Answer 1

$\huge\fcolorbox{red}{cyan}{-1}$

Step-by-step explanation:

$(x + y)( - x - y) \\ = > \bf{x = 1 \: and \: y = - 2} \\ = > (1 + ( - 2))( - 1 - ( - 2)) \\ = > (1 - 2)( - 1 + 2) \\ = > - 1 \times 1 \\ = > \boxed{ - 1}$

Hope it helped

Answer 2

Answer :-

(x + y)(-x - y) = -1.

Explanation :-

Given Values :

• x = 1.
• y = -2.

To Find :

• Value of (x + y)(-x - y)

Solution :

We are given with the values of x and y.

Put these values in the expression.

➨ (x + y)(-x - y).

➨ ((1) + (-2))(-(1) - (-2)).

➨ (1 - 2)(-1 + 2).

➨ (-1)(1).

➨ -1.

Therefore, (x + y)(-x - y) = -1.