Question

18. Add the expressions 4x² +3xy +9y² and 2x² - 9 xy +6y² and find the degree.​

Answer 1

Answer:

Question 18:

What should be subtracted from x2 − xy + y2 −x + y + 3 to obtain −x2 + 3y2 − 4xy + 1?

ANSWER:

Let 'M' be the required expression. Then, we have

x2 - xy + y2 - x + y + 3 - M = - x2 + 3y2 - 4xy + 1

Therefore,

M = (x2 - xy + y2 - x + y + 3) - (- x2 + 3y2 - 4xy + 1)

    = x2 - xy + y2 - x + y + 3 + x2 - 3y2 + 4xy - 1

Collecting positive and negative like terms together, we get

x2 + x2- xy + 4xy + y2- 3y2 - x + y + 3 - 1

= 2x2 + 3xy- 2y2- x + y + 2

Answer 2

Answer:

21x^2+12xy

Step-by-step explanation: