Problema Solution
The inside area of one of Brenda’s old blankets is 3139 square inches. To obtain the width of the border, she must solve the equation 4x^2-260x+4000=3139, where x is the width of the border in inches.
Brenda uses the quadratic formula to get solutions for x. One solution is 61.5 inches, but she knows that isn't the border of her blanket. The second solution must be the border.
What is the border of Brenda's blanket?
Answer provided by our tutors
Brenda solves the quadratic equation and comes up with the following set of solutions:
4x^2=260x+4000=3139
x={61.5, 3.5}
So the border of Brenda's blanket is 3.5 inches.