I have been a bit stuck on this question.
The product of two consecutive odd numbers is $143$. Find the next numbers.
I have made this into: $$ (2x+1)(2x+3)=143. $$ I got $x_1 = -7$ and $x_2 = -5$ for this, which doesn't seem right.
How can I fix this? (By the way we are only able to solve for $x$ by using factorising and not with the quadratic formula).