Question

From the sum of x2+3y2-6xy,2x2-y2+8xy,y2+8and x2-3xy subtract-3x2+4y2-xy+x-y+3

Answer 1

x2 ka Matlab x to the 2 ya 2x?

Answer 2

Question

Add x2 + 2xy + y2 to the sum of x2 − 3y2 and 2x2 − y2+ 9.

ANSWER:

Sum of x2 - 3y2 and 2x2 - y2 + 9

= (x2 - 3y2) + (2x2 - y2 + 9)

= x2 + 2x2 - 3y2 - y2+ 9

= 3x2 - 4y2 + 9

Now, required expression = (x2 + 2xy + y2) + (3x2 - 4y2 + 9)

                                      = x2 + 3x2 + 2xy + y2 - 4y2 + 9

                                      = 4x2 + 2xy  - 3y2 + 9