16Hit1600
Advanced MathMediumProduct of the outer coefficients

Advanced Math practice question

When (3x − 2)(x + 4) is written as ax² + bx + c, what is the value of a · c?

Answer: -24 or −24

Expanding gives 3x² + 10x − 8, so a = 3, c = −8, and ac = −24.

Common wrong answers

If you answered 24
24 has the wrong sign; c is −8.
If you answered 30
30 is a · b (3 × 10).
If you answered -8
−8 is c alone.

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