Is zw positive?

(1) z + w^3 = 20
(2) z is positive

Correct answer marked below

Statement (1) ALONE is sufficient

Statement (2) ALONE is sufficient

BOTH statements TOGETHER are sufficient

EACH statement ALONE is sufficient

Statements (1) and (2) TOGETHER are NOT sufficient

Correct

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Comments

TraJun 12

easy one but tricky, had to check negatives

BryanJun 15

same, the sign of w is the whole game here

RajatMay 24

thanks! helps a lot

What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.

Is zw positive?(1) z + w^3 = 20(2) z is positive