Question

plz answer fast it is urrgent ​

Answer 1

Answer

I. $x^2+2xy-y^2$

II. $5a+b-6$

For (I) let's say,

"B should be added to A to obtain C." ($A+B=C$)

We want $B$.

• $A=x^2+xy+y^2$
• $B$ is not known
• $C=2x^2+3xy$

$B=C-A$

$\Longleftrightarrow B=(2x^2+3xy)-(x^2+xy+y^2)$

$\Longleftrightarrow B=x^2+2xy-y^2$

So our answer is $x^2+2xy-y^2$.

For (II) let's say,

"B should be subtracted from A to get C." ($A-B=C$)

We want $B$.

• $A=2a+8b+10$
• $B$ is not known
• $C=-3a+7b+16$

$B=A-C$

$\Longleftrightarrow B=(2a+8b+10)-(-3a+7b+16)$

$\Longleftrightarrow B=5a+b-6$

So our answer is $5a+b-6$.

Hope this helps.