Question 819977: The area of a rectangle is 70 square feet. If the length is four more than twice the width, find the dimensions of the rectangle.
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! Lw = 70
L = 2w + 4
---
Lw = 70
(2w + 4)w = 70
2ww + 4w - 70 = 0
---
the above quadratic equation is in standard form, with a=2, b=4, and c=-70
---
to solve the quadratic equation, by using the quadratic formula, plug this:
2 4 -70
into this: https://sooeet.com/math/quadratic-equation-solver.php
---
the two real roots (i.e. the two x-intercepts), of the quadratic are:
w = 5
w = -7
---
answer:
w = 5 ft
L = 14 ft
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Calculate and graph the linear regression of any data set:
https://sooeet.com/math/linear-regression.php
|
|
|
