SOLUTION: I need help on how to find the equation in quadratic word problems and my teacher doesn't teach very well. I am okay with most of the ways on how to use the quadratic formula and g

Question 1153754: I need help on how to find the equation in quadratic word problems and my teacher doesn't teach very well. I am okay with most of the ways on how to use the quadratic formula and get standard form but I don't get how you find an equation using the information given in the word problem. I have tried asking for help and looking online but I still don't get it.
Question examples:
1) A rectangular piece of tin 40cm by 30cm is to be made into an open box with a base of 900cm^2 by cutting equal squares from the four corners and then bending up the sides. FInd the length of the side of the square cut from each corner.
2) Pete drove from Buffalo to Boston, a distance of 4000km. On the return trip, the speed was increased by 300km/h. If the total trip (There and back) took 13hours, what was the speed from montreal to San Fransico.
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

Problem 1)

After cutting the squares and then bending, the dimensions of the base of the box will be  (40-2x) cm and (30-2x) cm,

where x is the side of the square.


It is the first and the major step in the solution.


Then the area of the base of the box is the product  (40-2x)*(30-2x).

It should be equal to 900 cm^2, which gives you the equation


    (40-2x)*(30-2x) = 900.


Next, you should simplify it; reach a quadratic equation in standard form, simplify and solve.

Problem 2)

Please read your post to ensure that part 2) is NONSENSE.

PLEASE AVOID POSTING nonsense to this forum.

I don't like it VERY MUCH.

/\/\/\/\/\/\/\/

Also, NEVER post more than one problem/question per post.

It is the policy, the rule and the REQUIREMENT of this forum.

RELATED QUESTIONS
A chemist has 500ml of water. How much pure acid should be added to produce a solution... (answered by josgarithmetic)

Need help putting word problem into an equation. I have a quiz and test tomorrow and my... (answered by ikleyn)

Hello, I would like to know, if possible can you please explain to me how these algebra... (answered by stanbon,nerdybill)

Okay I'm Having Problems and I Need The Solution By At least Tonight It Would Be Very... (answered by KMST)

The voume (v) of a rectangular solid is 60 cubic meters. Find the length (l) of the... (answered by stanbon)

we are learning algebra in my 6th grade advanced class but i am not catching on to it... (answered by checkley75)

find the volume of a cylinder with a base area of 81 pie inches squared and height equal... (answered by mananth)

hello, my name is arielena These problems are about algebra 1 : linear word problems. I... (answered by Maths68)

I need to know how to write a polynomial equation of least degree with roots -3i, 3i, i, (answered by scott8148)