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Moving the term $18$ to the other side of the inequation with opposite sign
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$x^2+9x>0-18$
Learn how to solve problems step by step online. Solve the inequality x^2+9x+18>0. Moving the term 18 to the other side of the inequation with opposite sign. Subtract the values 0 and -18. Factor the polynomial x^2+9x. Add and subtract \left(\frac{b}{2}\right)^2, replacing b by it's value 9. Now, we can factor x^2+9x+\frac{81}{4} as a squared binomial of the form \left(x+\frac{b}{2}\right)^2.