Question

What is the positive solution of x^2-36 = 5x

Answer 1

x^2-5x-36 =0

=》(×+4)(x-9) =0

=》 x = 9 or -4

positive solution for x is 9

Answer 2

For this case we must find the positive solution of the following quadratic equation:

`x ^ 2-5x-36 = 0`

To find the solutions we factor, that is, we look for two numbers that when multiplied give as result -36 and when summed give as result -5.

These are:

-9 and +4

`-9 * 4 = -36\\-9 + 4 = -5`

So, we have:

`(x-9) (x + 4) = 0`

The roots are:

`x_ {1} = 9\\x_ {2} = - 4`

The positive solution is 9.

Answer:

9