Add the following algebraic expressions:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(i) 3a²b, -4a²b, 9a²b

= 3a²b + (-4a²b) + 9a²b

= 3a²b – 4a²b + 9a²b

= 3a²b

(ii)

= a + a - a

Taking L.C.M 3, 5 , 5 is 15

=11

=

=

(iii)

= 4xy² – 7x²y + 12x²y – 6xy² – 3x²y + 5xy²

= 4x² + 12x²y – 3x²y – 7x²y – 6xy² + 5xy²

= 3xy² + 2x²y

(iv)

Adding all, we get

=

= + +

= - +

(v)

Adding all, we get

= xy + y + + y - - xy

= + +

= - -

(vi)

Adding all, we get

= x³ - x² + + x³ + x² – x + + x² - x – 2

= x³ + x² - +

= 5x³ + x² -