Question

x^2+4x<45

Answer 1

What are you trying to do with this equation ?

Answer 2

^ ^

Answer 3

Maybe try by completing the square
X^2+4x<45
X^2+4x+___<45
4/2=2^2=4
X^2+4x+4<45+4
(X-2)^2<49
X-2<7
X<5