Rewrite x^2+12x+42 in the form (x+b)^2 +c

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

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