❌to solve the equation below by completing the square, what is your first step?
4x^2+16x=20
a) add 8 to each side of the equation.
b) add 64 to each side of the equation
c) multiply both sides of the equation by 1/4.
d) multiply both sides of the equation by 1/8.

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?