C. -6 and 3
x² + 3x - 18 < 0
write the inequality:
-6² + 33 - 18 < 0
substitute -6 for x and 3 for x:
-36 + 33 - 18 < 0
simplify:
-21 < 0
-21 is less than 0. so, (-6, 3) is a solution to an inequality.
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Answers & Comments
C. -6 and 3
x² + 3x - 18 < 0
write the inequality:
-6² + 33 - 18 < 0
substitute -6 for x and 3 for x:
-36 + 33 - 18 < 0
simplify:
-21 < 0
-21 is less than 0. so, (-6, 3) is a solution to an inequality.