Question

The product of Riya age 3 years ago and 5 years later is 240. find the present age​

Answer 1

Answer:

Step-by-step explanation:

let Riya's age after 5 years be x+5

and 3 years ago be x-3

ATQ

(x+5)(x-3)=240

$x^{2} -3x +5x - 15 = 240\\x^{2} -3x +5x - 15 - 240 =0\\x^{2} +2x - 255 =0 \\x^{2} -15x+17x-255 =0\\x(x-15) +17(x-15) =0\\(x-15)(x+17) =0\\\\ => x - 15 =0\\ x = 15\\ => x + 17 =0\\ x = -17$

since age cannot be negative

therefore x $\neq$ -17

=> present age is 15x  = 15