Question

Had Ajita scored 10 more marks in her mathematics test out of 30 marks, 9 times these marks would have been the square of the actual marks .how many marks did she get in the test?

Answer 1

Answer:

Let her actual marks be x.

9(x+10)=x^2

x^2-9x-90=0

x^2-15x+6x-90=0

x(x-15)+6(x-15)=0

(x+6) (x-15) =0

x = -6

x= 15

x can't be negative.

Hence, x=15 .

So, Ajita got 15 marks in her test.

_______

Hope it helps.✌