I NEED HELP PLEASE UR AMAZING IF U GET THIS RIGHT

What is the product? (x2+3y+7) [yy+1)

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Y= a(x-3)squared-1 what is the value of a