Find the value of √45 × √20

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

What’s the answer ? use the picture to see the problem

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible