Can you please write this statement into algebraic expression and simplify into quadratic equation.( Three time square the number and 2 times...

Let us assume that the number is
x.

Then 3 times square x is
3x^2.

And we will add 2 times fifth x ==> 3x^2 +
2x/5 = 3x^2 +(2/5)x

==> All divide by (x+7) 
==> [(3x^2 + (2/5)x] / (x+7)

==> all added to
9 ==> [ 3x^2+ (2/5)x ] / (x+ 7)  + 9 =
0

==>  (3x^2 + 2x/5 ) / (x+7) + 9 =
0

We will
simplify.

==> (15x^2 + 2x) / 5(x+7) + 9 =
0

==> 15x^2 + 2x = -45 (x+
7)

==> 15x^2 + 2x = -45x -
315

==> 15x^2 + 47x + 315 =
0