Q4 of 59 Page 30

Subtract:

(i) –2xy + 3xy2 from 8xy;


(ii) a – b – 2c from 4a + 6b – 2c.

Given problem asks to subtract

(i) –2xy + 3xy2 from 8xy


⇒ 8xy – ( –2xy + 3xy2 )


⇒ 8xy +2xy –3xy2


⇒ 10xy –3xy2


(ii) a – b – 2c from 4a + 6b – 2c


⇒ 4a +6b –2c – (a– b – 2c)


⇒ 4a +6b –2c –a + 2c +b


While adding or subtracting, the like term`s numerical coefficient are added or subtracted


⇒ (4–1) a + (6 +1) b +( –2 +2) c


⇒ 3a +7b


More from this chapter

All 59 →
2

Simplify:

(i) 7x – 9y + 3 – 3x – 5y + 8;


(ii) 3x2 + 5xy – 4y2 + x2 – 8xy – 5y2.

 3

Add:

(i) 5a + 3b, a – 2b and 3a + 5b;


(ii) x3 – x2y + 5xy2 + y, –x3 – 9xy2 + y, and 3x2y + 9xy2.

 1

Complete the following table of products of two monomials:

 2

Find the products:

(i) (5x + 8)3x


(ii) (–3pq) (–15p3q2 – q3)


(iii) (3a3 – 3b3)


(iv) –x2(x – 15).