first line: 35-x^2+2x=0
next important line: x^2-2x-35 = 0 , I don't know why you did all that other stuff in between.
(see my response to a similar problem in the reply to "Lori" two postings down from here)
so x^2-2x-35 = 0
(x-7)(x+5) = 0
then x=7 or x = -5
you had as factors (x-7)(x+5) (x-7)(x+5).
Why 4 of them?? It was only a quadratic, so it could have at most two factors.
that was from the example we were given, I just followed it. Our instructor was ill and the sub handed out examples, no one understood and the sub could not explain! Sorry I have the correct answers, but I need to go back and show my work the right way? I will look in my book. Thanks
Here is all you would have needed, down to the essential steps
35-x^2+2x=0 (multiply by -1 to get it in standard form
x^2 - 2x - 35 = 0 (this factors to)
(x-7)(x+5) = 0
therefore x-7 = 0 or x+5 = 0
therefore x = 7 or x = -5
If you are asked to verfy the solution, this is how you would do that:
if x=7, then
L.S. = 7^2 - 2(7) - 35
= 49 - 14 - 35 = 0
if x= -5
L.S. = (-5)^2 - 2(-5) - 35
= 25 + 10 - 35
Therefore x = 7 or x = -5
Algebra-Graphing Linear Equation - Y<2X+4 The way I unerstand from the book ...
math - How do you write a simplier problem for 23 x 20 ? I do not understand ...
Algebra II - How do I work the following problem? I cannot find an example in my...
Algebra - Find a counterexample to the statement 4^n + 1 is divisible by 5...how...
Algebra 2 - A blue print of a shopping complex shows that the bottom edge of the...
Algebra - My book uses the slope y-intercept method for graphing. I am trying to...
english - How can I make this into two sentences? Note: Ending the first ...
algebra - An algebra book weighs 6 oz less than twice as much as a grammar book...
Math - an algebra book weighs 6 oz less than twice as much as grammar book. if 5...
history - my book shows me 3 graphs. One is Imperialism in Africa, c. 1900 that ...