SOLUTION: The hypotenuse of a right triangle is 2 ft less than three times the shortest leg. The longer leg is 3 ft less than three times the shorter leg. Find the length of each side of the

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: The hypotenuse of a right triangle is 2 ft less than three times the shortest leg. The longer leg is 3 ft less than three times the shorter leg. Find the length of each side of the      Log On


   



Question 1102193: The hypotenuse of a right triangle is 2 ft less than three times the shortest leg. The longer leg is 3 ft less than three times the shorter leg. Find the length of each side of the triangle.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
l^2+s^2=h^2
h=3*s-2
l=3*s-3
(3*s-3)^2+s^2=(3*s-2)^2
(3s-3)*(3s-3)=9s^2-6s+9
(3s-2)*(3s-2)=9s^2-4s+4
9s^2-6s+9+s^2=9s^2-4s+4
subtract 9s^2 from both sides
add 4s to both sides
subtract 4 from both sides
s^2-2s+5=0
I suspect that you copied something incorrectly
Solved by pluggable solver: Quadratic Formula
Let's use the quadratic formula to solve for x:


Starting with the general quadratic


ax%5E2%2Bbx%2Bc=0


the general solution using the quadratic equation is:


x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29




So lets solve x%5E2-2%2Ax%2B5=0 ( notice a=1, b=-2, and c=5)





x+=+%28--2+%2B-+sqrt%28+%28-2%29%5E2-4%2A1%2A5+%29%29%2F%282%2A1%29 Plug in a=1, b=-2, and c=5




x+=+%282+%2B-+sqrt%28+%28-2%29%5E2-4%2A1%2A5+%29%29%2F%282%2A1%29 Negate -2 to get 2




x+=+%282+%2B-+sqrt%28+4-4%2A1%2A5+%29%29%2F%282%2A1%29 Square -2 to get 4 (note: remember when you square -2, you must square the negative as well. This is because %28-2%29%5E2=-2%2A-2=4.)




x+=+%282+%2B-+sqrt%28+4%2B-20+%29%29%2F%282%2A1%29 Multiply -4%2A5%2A1 to get -20




x+=+%282+%2B-+sqrt%28+-16+%29%29%2F%282%2A1%29 Combine like terms in the radicand (everything under the square root)




x+=+%282+%2B-+4%2Ai%29%2F%282%2A1%29 Simplify the square root (note: If you need help with simplifying the square root, check out this solver)




x+=+%282+%2B-+4%2Ai%29%2F%282%29 Multiply 2 and 1 to get 2




After simplifying, the quadratic has roots of


x=1%2B2%2Ai or x=1-2%2Ai