Use completeling the square to solve for x in the equation (x-12)(x+4)=9

x=

Step-by-step explanation:

First step. Solve the binomial product from the left side of the equation:

Second step. Simplify and move independent terms to the right side of the equation:

Third step. Find a number that multiplied by two gives -8, then square this number and sum it on both sides of the equation:

Fourth step. Write the left side of the equation as a squared binomial:

Fifth step. First, take the square root and then add 4 to both sides of the equation to solve for x:

on friday there were 15 birds

wholesale price is the initial price before markup. retail price comes after the markup.

a price of 8 bucks that's marked up by 100%   is

formula: initial price + (percent markup in fraction/decimal)(initial price)

8+(1)(8)

8+8

16

retail price is $16.