Question

6. What should be added to 2xy + 3y - 3 to get x
+y + 2y + 1?
7. What should be subtracted from x3 - 1 to get
Zx – 2y² – 1?​

Answer 1

Step-by-step explanation:

Asked:

1)

What should be added to 2xy + 3y - 3 to get x ?

=} let the number to be added be a,

Then,

2xy + 3y - 3 + a = x

By transposing the terms to the left side..

a = x -( 2xy + 3y - 3)

a = x - 2xy -3y +3

There fore ,

x - 2xy -3y +3 should be subtracted from 2xy + 3y - 3 to get x.

2)

What should be subtracted from x3 - 1 to get Zx – 2y² – 1?

Let the number be b, then,

x3 - 1 - b = Zx - 2y^2 -1

=} (-b) = Zx - 2y^2 - 1 - x3 + 1 + b

multiplying both sides with (-1),

b = {-Zx + 2y^2 + 1 + x3 - 1 - b}

Therefore,

{-Zx + 2y^2 + 1 + x3 - 1 - b} should be subtracted from x3 - 1 to get

Zx – 2y² – 1

Answer 2

Step-by-step explanation:

7) x-(x³-1)=Zx-2y²-1

x= Zx - 2y²-1+(x³-1)

x=Zx-2y²-1+x³-1

x=Zx-2y²-2+x³