If 12x=19^2-11^2 , what is the value of x?

SSC CHSL 11 Jan 2017 Shift 2 Paper

Question : 89 of 100

Marks: +1, -0

12x=19^2-11^2

, what is the value of x?

Solution:

Expression :

12x=19^2-11^2

⇒

12x = (19 − 11)(19 + 11)

⇒

12x = (8)(30)

⇒

x ={8×30}/ 12

⇒

x = 2 × 10 = 20

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