What number is represented by −3x²+√2x+1/2 when x=√2?

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 (monthly car loan payment per $1,000 borrowed) i need !

Precalculus question, image attached.

How do i put 3(x+7) in distributive property