Question

The product of virat kohli age 8years ago and 6years later is 680 Find his present age.
Ch4
Std 10

Answer 1

Answer:

Under root -361

Step-by-step explanation:

Let virat kohli age be = x

So, virat kohli age before 8 years = x - 8

and, virat kohli age after 6 years = x + 6

A/Q

(x - 8) * (x + 6) = 680

= x square + 6x - 8x - 42 = 680

= x square - 2x - 42 = 680

= x square - 2x = 680 + 42

= x square - 2x = 722

= x square = 722/-2x

= x square = -361

= x = under root -361

Answer 2

Answer:

28 years.

Step-by-step explanation:

Let the present age of V.K be x.

Given:

product of his age after 6 years and before 8 years is 680.

Solution:

$\sf(x-8)(x+6)=680$

$\sf x^{2}+6x-8x-48=680$

$\sf x^{2}-2x-48=680$

$\sf x^{2}+26x-28x-728=0$

Factorizing:

         x² - 2x - 728.

x² - 2x - 728

x² + 26x - 28x - 728

x(x+26) - 28(x+26)

(x-28)(x+26)

(x-28)(x+26) = 0

So, his age is 28 years.