How do you rewrite an equation by completing the square?
x^2+10x+21=0

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

A+b= 17, ab=70, find the value of |a-b|