Here's the question you clicked on:
Shikar23234
Simplify: (x - 4)2 x2 - 16 x2 - 8 x2 - 8x + 16 x2 - 16x + 8
When you have a squard function (or any function raised to an exponent), u need to set it up as: (x-4)(x-4)
So it would be x2 -8?
Nope. U now need to distribute the x and 4 (multiply) with the terms in the OTHER parenthesis
(x-4)(x-4)= (x*x) - (4*x) = (x^2-4x) <--- this is only part of it
Oh!!!! So you basically just multiply the x to the other side and then do the same with the 4. So it would be 4 times x then 4 times 4. Right?
Show me your answer when finished
So i know the 16 goes on the very end so im thinking its C but i dont know how it gets the 8.
Pay attention to your pos/neg signs when you combine like terms. x^2 -4x-4x+16 ---> Because you have two of the same (-4x), u combine them. -4-4= -8. Do u see??
Sort of. So its basically x - y + (y*y) ?
Errr, i dont understand that little formula. Im sorry. Let me try another way. 1st, do u see why I have two -4's??
Uhm yea. because its (x-4) and (x-4). So you just put them togeather. x= x2 and -4= -8. Right?
Hmmm, u're right. But Hopefully u wont confuse yourself with that formula u had before
Well what i dont understand is why you have to multiply it when your just simplifying it.
Simplify means that you are turning the function/equation into ONE form. Basically, you want to combine all like terms on both sides and reduce it to it's simplest form.
But then what if your multiplying it? For instance 5xy(2x - y). Does that mean you just to the same thing?
The 1st problem u had above, is not giving us any information. But in it's simplest form, we can find maximums & minimums of a graph, points of intersection, slope. You'll learn about all that stuff later. But you cant find the information you need with it being in the simplest form
Yes, u do the same thing
BUT, 5xy is considered ONE term. Dont separate the 5 from x & y
So you just separate the 5xy from the (2x - y) ? Then multiply the 2 together?
No need to separate anything. A number infront of a parenthesis also means to multiply. Or, to distribute the 1st number with each number on the inside of the parenthesis
It means that (10*9x) PLUS (10*3).
So it would be 90x+30. Would you need to simplify?
CORRECT! If it is simplified again, it would go back to its orginal form 10(9x+3)
Ok, i really suck at explaining! im sorry
Ohhhhhh! I understand now! Thank you!!!!!
cooool! No problem. Do u get the -8 though? I can draw a pic.
Yea i understand that part now. Seriously though thanks abunch!
Cool. Glad i helped somehow