Consider a plane that passes through the three points

$P=(2,-5,1),Q=(-4,5,4),$ and $,R=(-5,1,1)$

Give a scalar equation of this plane.

$P$ :

$a^b$

$\frac{a}{b}$

$\sqrt[\phantom{2}]{a}$

$|a|$

$$

$sin(a)$

III

$?$

$$

FORMATTING: Give your answer as an equation, eg: $2x+3y+5z+4=0.$