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What is the solution of the inequality −4x < 16?

Answer and explanation

Correct answer: x > −4

The governing concept is reversal of an inequality when dividing by a negative number. In −4x < 16, divide both sides by −4. Because the divisor is negative, the symbol < changes to >, giving x > −4. This can also be checked by testing the boundary: x = −4 gives −4(−4) = 16, but the inequality is strict, so the boundary itself is excluded. A value such as x = 0 gives 0 < 16, which is true, confirming that values greater than −4 belong to the solution set. Values less than −4 fail; for example, x = −5 gives 20 < 16, which is false. Option B forgets to reverse the sign, while options C and D mishandle the sign of the constant. Therefore option A is correct.

Related tags

Linear InequalitiesNegative CoefficientStrict InequalityAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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