Urgent question please help me.!! you purchase a dishwasher for $1,249. 99 plus 4% sales tax The Appliance Store offers an installment loan that allows you to pay for the dishwasher by making the 12 equal monthly payment of $124.58 what is the cost of credit in dollars for this loan round your answer to the nearest cent

b =  

Step-by-step explanation:

Using the discriminant for nature of roots ( x- intercepts )

If b² - 4ac = 0 then roots are real and equal ( that is only 1 x- intercept )

Given

f(x) = x² - 2bx + b² + 2b - 1

with a = 1, b = - 2b and c = b² + 2b - 1, then

(- 2b)² - 4(b² + 2b - 1) = 0 ← distribute and simplify left side

4b² - 4b² - 8b + 4 = 0

- 8b + 4 = 0 ( subtract 4 from both sides )

- 8b = - 4 ( divide both sides by - 8 )

b =