Question

if 9 is added to three times a positive number the result is equal to twice the square of the number.find the number?​

Answer 1

Answer: 3

Step-by-step explanation:

Let m be the number

Then 3m+9=2m^2

2m^2 - 3m - 9 = 0

2m^2 - 6m + 3m - 9 = 0

2m(m-3) + 3(m-3)=0

(m-3)(2m+3)=0

m-3=0 or 2m+3=0

So m=3 as m is a positive number