$(ax+3)(5x^{2}-bx+4)=20x^{3}-9x^{2}-2x+12)$<br/><br/>The equation above is true for all $x)$, where $a)$ and $b)$ are constants. What is the value of $ab)$ ?

MM

Mashaal Masha

Feb 17, 2024

$(ax+3)(5x^{2}-bx+4)=20x^{3}-9x^{2}-2x+12$The equation above is true for all $x$, where $a$ and $b$ are constants. What is the value of $ab$?

Difficulty: Hard

A:

18

B:

20

C:

24

D:

40

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ID: 65d107fbdbc6daab1cbc521b