Question

If square of a natural number diminished by 75 is equal to10 times of that number, then the number is?

Pls answer fast!!

Answer 1

Answer:

I think so the number is 7.5 dear

hope so it helps you out dear

Answer 2

Answer:

let the number be x

x^2-75=10x

x^2-10x-75=0

solving the quadratic equation

x^2+5x-15x-75=0

x(x+5)-15(x+5)=0

(x-15) (x+5) =0

so x=15,-5

as it is given is a natural number so it can't be -5 so the answer is 15.