Question

4) What should be added to x + 3y – 2z to get 4x – 3z + 4y.​

Answer 1

Let the number be a

and the answer be r

and the number we have to find be u

So,

a+u=r

x+  3y – 2z+u= 4x – 3z + 4y

u= 4x – 3z + 4y-x+  3y – 2z

u=4x-x-2z-3z+4y+3y

u=3x-z+7y

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