Question

factorize 2x^2+5y^2+z^2-2 cube root 10 x y minus 2 cube root 5 y z + 2 cube root 2xz​

Answer 1

Step-by-step explanation:

ynomial – Exercise 2.5 – Class IX

April 1, 2017Ashoora Arif

Use suitable identities to find the following products:

(i) (x + 4) (x + 10)

(ii) (x + 8) (x – 10)

(iii) (3x + 4) (3x – 5)

(iv) (y2+ 3/2 ) (y2– 3/2 )

(v) (3 – 2x) (3 + 2x)

Solution:

(i) (x + 4) (x + 10)

Using identity (x + a)(x + b) = x2 + (a + b)x + ab

(x + 4)(x + 10) = x2 + (4 + 10)x + 4×10

= x2 + 14x + 40

 

(ii) (x + 8) (x – 10)

Using identity (x + a)(x + b) = x2 + (a + b)x + ab

(x + 8) (x – 10) = x2 + (8 – 10)x + 8x(-10)

= x2 – 2x – 80x