Q. If a3bc2<0, which of the following must be correct?(A) a<0&c<0(B) b<0&c<0(C) a<0&b>0(D) a<0&b>0 or a>0&b<0
Analyze inequality signs: Analyze the given inequality a^3 \cdot b \cdot c^2 < 0. Since a3 is cubed, it will have the same sign as a. The term c2 is squared, so it will always be non-negative (zero or positive). Therefore, the sign of the inequality is determined by the signs of a and b.
Consider sign combinations: Consider the possible sign combinations for a and b that would make the inequality true.If a is positive, then b must be negative to make the product negative because c2 is always non-negative.If a is negative, then b must be positive to make the product negative because c2 is always non-negative.
Match with options: Match the possible sign combinations to the given options.Option (A) states a < 0 and c < 0, but c's sign does not matter since c2 is always non-negative.Option (B) states b < 0 and c < 0, but this does not consider the sign of a.Option (C) states a < 0 and b > 0, which is one possible correct combination.Option (D) states a < 0 \& b > 0 or c < 00, which includes both possible correct combinations.
Determine correct answer: Determine the correct answer based on the analysis.Option (D) is the only option that includes all possible correct sign combinations for a and b that satisfy the inequality a^3 \cdot b \cdot c^2 < 0.