Question

Exercise 10.2
1) Find the following products.
(i) 3x2a
(ii
(iii) 6xX(-2xy)
(iv
(v) 2a? x (-3ab)
(vi
(vii) a 5x a
(ix) -bx3y2 X (-ax“y)
(viii
(x​

Answer 1

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