12344321 Posts: 1, Reputation: 1 New Member #1 Mar 2, 2007, 07:40 AM
solving Quadratic Equations/ WORD PROBLEMS
I HAVE NO IDEA HOW TO DO SOMTHINGLIKE THIS??

The length of a rectangle is 2 feet more than the height. The area of the rectangle is 5 foot , find the base?
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #2 Mar 2, 2007, 07:43 AM
here you need to solve simultaneous equations

$l = h+2 \\
lh = 5$

Now you can rearrange the first equation for h, put it into the second equation, then solve for l and that should be the base youa re looking for.

Let me know if you get stuck.
 mloda492 Posts: 1, Reputation: 1 New Member #3 Nov 8, 2007, 08:54 PM
The length of a rectangle is 2 feet more than the height. The area of the rectangle is 5 foot , find the base?

Originally Posted by Capuchin
here you need to solve simultaneous equations

Now you can rearrange the first equation for h, put it into the second equation, then solve for l and that should be the base youa re looking for.

Let me know if you get stuck.
I am stuck.
 Capuchin Posts: 5,255, Reputation: 656 Uber Member #4 Nov 9, 2007, 12:54 AM
You don't know how to solve simultaneous equations like the ones I posted?
 terryg752 Posts: 197, Reputation: 4 Junior Member #5 Nov 9, 2007, 04:58 AM
(WHY use 2 variables and make it harder to solve?)

(One variable can do the job and obviate the need of simultaneous equation)

Let me try to explain:

Suppose length is L (as we want to find value of length).

Then height has to be L - 2

So the area = Length times height = 5

L (L - 2) = 5

L^2 - 2L - 5 = 0

Solve this quadratic equation to get the Length L.

You get 2 roots of this equation, one root is negative.

As Length cannot be negative, ignore the negative root of the quadratic.
 winona_lily Posts: 1, Reputation: 1 New Member #6 Oct 3, 2010, 02:55 AM
The length of a rectangle is 2 feet more than the height. The area of the rectangle is 5 foot , find the base?

first do the cancellation of word except for the question at the end ( cause that's the main) then:

th length(L) of a rectangle is (=) two (2) feet more than(+) the height (h). The area(a) of the rectangle is five(5) foot...

draw the rectangle to get more easier
the equation is ---------------->h(h)+2h-5=0 "when you multiply the letter by itself the answer will be square''
factor it or do some ways to solve it...

hope it helps but for more easier to understand go to YouTube and try there =)=)=)=)

 Question Tools Search this Question Search this Question: Advanced Search

## Check out some similar questions!

Quadratic Equations... Problem Solving [ 6 Answers ]

A ball is thrown straight up. Its height, h(in metres), after t seconds is give by h= -5t^2+10t+2. To the nearest tenth of a second, when is the ball 6m above the ground? Explain why there are two answers. I don't know how to manipulate the formula and how to solve for this problem. Second...

Quadratic Equation word problem [ 4 Answers ]

A boat travels at a speed of 20 mph in still water. It travels 48 miles upstream, and then returns to the starting point in a total of 5 hours. The speed of the current is ____mph? I am not getting the setup right. Can someone help me?

Solving Quadratic Equations to Graph [ 3 Answers ]

How would I graph x^2-3x=4 to solve it? And I would I check? Thank You.

Solving Equations Algebraically? [ 15 Answers ]

Can somebody please explain to me how to solve this algebraically to find the x-intercepts? x squared - 5x = -6 Sorry, I forgot it. XP

Finding quadratic eqaution from a word problem [ 1 Answers ]

A farmer uses 400m of fencing to create a rectangular pig pen and to divide it into four equal regions. Algebraically determine the function which gives the area of the pig pen as a function of its width, and state the dimensions that produce maximum area. How do I start this off.. can anyone...