anonymous
  • anonymous
x2 - 3x = 4 (the 2 is smal)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
lilg132
  • lilg132
x^2 - 3x - 4 = 0 what two numbers added together give you -3 and multiply to give you -4?
anonymous
  • anonymous
A?
lilg132
  • lilg132
LOL

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More answers

anonymous
  • anonymous
A) 1 4 B) 1 -4 C) -1 4 D) -1 -4
Mimi_x3
  • Mimi_x3
Just use wolfram alpha if you are lazy
lilg132
  • lilg132
i'm not giving you anymore answers if you dont want to learn
anonymous
  • anonymous
i wanna learn just not too good at this lol :)
anonymous
  • anonymous
\[(x-4)(x+1)=0\]
lilg132
  • lilg132
well stop guessing and try and understand
lilg132
  • lilg132
what two numbers can i add together to give me -3
anonymous
  • anonymous
1+2
lilg132
  • lilg132
no that will give you +3 not -3
lilg132
  • lilg132
-4 + ? BIG CLUE
anonymous
  • anonymous
1-2?
lilg132
  • lilg132
that will give you -1
anonymous
  • anonymous
1+2-6?
lilg132
  • lilg132
i said two numbers
lilg132
  • lilg132
not three
anonymous
  • anonymous
0-3?
lilg132
  • lilg132
try taking a look at where i said BIG CLUE !
lilg132
  • lilg132
good your getting there
lilg132
  • lilg132
that would give you -3 but we need to find two numbers that give you -3 and the same two numbers need to multiply to give you -4
anonymous
  • anonymous
plz i only have 10 minutes left
lilg132
  • lilg132
its touching if you want to learn you will make more time
anonymous
  • anonymous
plz i want to learn but just dont have time right now
anonymous
  • anonymous
ok so you have x2 - 3x = 4 the first thing you want to do is equal this to zero, we can do that by subtracting 4 x^2-3x-4=0 Now, like what that person said, what can you multiply to get -4, and add to get -3? now let's guess and check. 1 * 4 = 4, but 1 + 4 = 5, ew that won't work hmm. 1 * -4 = -4, and 1 - 4 = -3 that works! now we use these two numbers, 1 and -4 and plug it back into the original equation (take the -3x away) x^2+1x-4x-4 basically what we did is split the -3 apart, because you see, 1x-4x equals -3x so it's basically the same thing, but the point of doing this is that you can factor by grouping. so lets group the first two terms, x^2 and 1x, what two numbers, or variables, go into both of these? well, x does. x Now what's x divided by x^2? that's just x x ( x now what's x divided by 1x? 1. x ( x +1 ) you know this is correct when you use the distributive propetry and get what you use to have|dw:1323571839146:dw| now, let's factor the other two terms, -4x and -4 these look like they both go into -4 -4 now, -4x divided by 4? just x. -4 ( x -4 divided by -4? 1. -4 (x+1) Now, lets bring it all together. the numbers in the parentheses should be the same (you got x+1 in both, so it's right. (x+1) now let's bring over the numbers that aren't in parentheses x and -4 just put those in parentheses like (x-4) the factored version is (x+1)(x-4) now, we have to equal both of these to zero and solve like a regular algebra problem to get your two solutions x+1=0 subtract 1 from both sides x=-1 do the same thing to the other one x-4=0 add 4 to both sides x=4 those are your two solutions x=-1 and x=4
anonymous
  • anonymous
if you don't understand something tell me
anonymous
  • anonymous
so what letter is answer?
anonymous
  • anonymous
c
anonymous
  • anonymous
i just typed it above
anonymous
  • anonymous
thanx hun that worked :) <3
anonymous
  • anonymous
That's a miracle <3
anonymous
  • anonymous
well didn't you read what i wrote?
anonymous
  • anonymous
Well, all she cares is the letter
lilg132
  • lilg132
no you just wasted your time neverforgetvivistee
anonymous
  • anonymous
well flutter
anonymous
  • anonymous
flutter come on
anonymous
  • anonymous
big kisses hun, thanx :)
anonymous
  • anonymous
i put real thought into that
anonymous
  • anonymous
flutter you hot cutie u stupid feather
lilg132
  • lilg132
i've been trying for a while as well now but she just doesnt want to learn she doesn't have 'time' to learn apperently
anonymous
  • anonymous
She doesn't even understand the very basic of algebra.

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