Question

the product of Reena's age 5 years ago and her age 8 years later is 30 . find her present age step by step

Answer 1

Answer:

Her present age is 7 years.

Step-by-step explanation:

Let her age is x years

By problem

(x-5)(x-8)=30

x^2+3x-70=0

x^2+10x-7x-70=0

x(x+10)-7(x+10)=0

(x-7)(x+10)=0

Either Or

x-7=0 x+10=0

x=7 x=-10(NOT TO BE TAKEN)

THEREFORE x=7 i.e.her present age is 7 years.

Answer 2

Answer:

7 yrs

Step-by-step explanation:

Let age of reena be x

age of reena 5 years ago= x-5

age of reena 8 years later= x+8

according to the question

(x-5) (x+8)=30

x^2+8x-5x-40=30

x^2+3x-40-30

x^2+3x-70=0

x^2+10x-7x-70=0

x(x+10)-7(x+10)=0

(x-7) (x+10)=0

since age cannot be negative.

hence value of x will be 7.

so reenas present age is 7 yrs

hope it helps you