Question

Please solve 3rd questions

Answer 1

Answer:

Step-by-step explanation:

(X-2)(x+3)=84

X^2+x-6=84

X^2+x-90=0

X^2+10x-9x-90=0

X(x+10)-9(x+10)=0

X= -10 rejected x=9

The present age of her is 9

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Answer 2

Answer:

Parnika's age(presnt) is 9 years.

Step-by-step explanation:

Let x be the age of Parnika

(x - 2)(x + 3) = 84

x² + 3x -2x -6 = 84

x² + x -6 - 84 = 0

x² + x -90 = 0  

Splitting the middle term,

x² + 10 x - 9x -90 = 0

x(x+10) -9(x+10)

x+10 = 0                        x - 9= 0

x = -10                           x=9

Age cannot be in negative,

∴Parnika's age is 9 years.