Question 281519
Judging by your question, writing out the equation is:

{{{2x + x^2 = 143}}}

In order to solve this equation, you need to get everything on one side:

{{{x^2 + 2x - 143 = 0}}}

We need to find two numbers that add up to be positive 2 and multiply to be 143. 143 is 13 * 11 which is a coincidence because those are two apart from each other.

We get

{{{(x + 13)(x - 11) = 0}}}

Using zero product principle, we know that

{{{(x - 11) = 0}}}
{{{highlight (x = 11)}}}

or 

{{{(x + 13) = 0}}}
{{{highlight (x = -13)}}}


Both of these are your answers! See ya around!