anonymous
  • anonymous
(2x – 1)(x + 7) = 0 Did i do this right guessing I distribute 2x*x = 2x^2 + 2x*7=14. -1* x = x -1*7 = -7 2x^2 +14+ x -7 2x^2 +x = 2x^3 14 -7= 7 2x^3+ 7
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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pooja195
  • pooja195
Are we solving for x?
anonymous
  • anonymous
Solve each quadratic equation. Show your work. that's what it says.
pooja195
  • pooja195
so they want the value of x?

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More answers

pooja195
  • pooja195
(2x – 1)(x + 7) = 0 We would use the 0 product property right? @jim_thompson5910 :/ am i right?
anonymous
  • anonymous
Huh?
jim_thompson5910
  • jim_thompson5910
|dw:1437707414800:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1437707424790:dw|
jim_thompson5910
  • jim_thompson5910
solve each equation for x
pooja195
  • pooja195
i was right :)
pooja195
  • pooja195
@Ashtaroth You are doing more work than needed
anonymous
  • anonymous
More work then needed? What do you mean?
pooja195
  • pooja195
You dont need to do all that work just do what @jim_thompson5910 drew
anonymous
  • anonymous
Oh. Kool then.
anonymous
  • anonymous
So after that i'm finish?
pooja195
  • pooja195
yes u will have 2 solution's
UsukiDoll
  • UsukiDoll
after you solve those equations .. yes.. there should be x = (two numbers)
pooja195
  • pooja195
x=? x=?
UsukiDoll
  • UsukiDoll
|dw:1437707649100:dw|
anonymous
  • anonymous
2x-1 and x+7=0
anonymous
  • anonymous
Guess i was wrong then :P
anonymous
  • anonymous
I think i got it though. Thank you all for you'r help :)
pooja195
  • pooja195
:)
UsukiDoll
  • UsukiDoll
you were distributing... not solving for x . the problem is already factored
anonymous
  • anonymous
So.. My answer was right or wrong?
UsukiDoll
  • UsukiDoll
your attempt was way off
pooja195
  • pooja195
Wrong you didnt even solve for x
anonymous
  • anonymous
Heh.. So i was wrong?
pooja195
  • pooja195
yes
anonymous
  • anonymous
Okay. so i'm suppose to solve the quadratic equation. then show my work.
pooja195
  • pooja195
|dw:1437708079679:dw|
pooja195
  • pooja195
^solve for x .-.
jim_thompson5910
  • jim_thompson5910
focus on just 2x-1 = 0 what number can we replace x with to make the equation true?
anonymous
  • anonymous
-2?
LynFran
  • LynFran
you were suppose to work the problem to solve for x... here is an example|dw:1437715265345:dw|
jim_thompson5910
  • jim_thompson5910
2x-1 = 0 2*(-2)-1 = 0 ... replace x with -2 -4 - 1 = 0 -5 = 0 ... this is a false equation so x = -2 isn't the answer
anonymous
  • anonymous
Alright.
jim_thompson5910
  • jim_thompson5910
look at what LynFran posted
UsukiDoll
  • UsukiDoll
so we need to find that x that makes the statement true.. @LynFran provided a good example :)
anonymous
  • anonymous
So we divide?
UsukiDoll
  • UsukiDoll
consider 2x-1 = 0 we need to solve for x. ... do we add, subtract, multiply , or divide?
anonymous
  • anonymous
Add?
UsukiDoll
  • UsukiDoll
yeah. add what number to both sides?
anonymous
  • anonymous
2x+1 and -1+1? 3x =0?
anonymous
  • anonymous
Wifi is bad
UsukiDoll
  • UsukiDoll
umm we can't combine 2x +1 however we do add 1 to both sides 2x-1=0 2x=1 now how do we get x by itself
anonymous
  • anonymous
Hmm. subtract -2 from both sides?
UsukiDoll
  • UsukiDoll
no.
UsukiDoll
  • UsukiDoll
hint: use division
anonymous
  • anonymous
divide by 2x/2 1/2?
UsukiDoll
  • UsukiDoll
yeah 2x=1 divide 2 from both sides 2x=1 --- --- 2 2 x = 1/2
UsukiDoll
  • UsukiDoll
now for x+7=0 how do we get x by itself?
anonymous
  • anonymous
add the x with the 7 then divide by 7?
UsukiDoll
  • UsukiDoll
we don't have to do division... for x+7=0 because there is no number attached to the variable on the previous problem we had to divide because we want x by itself we just have x+7=0
UsukiDoll
  • UsukiDoll
what's the opposite of addition?
anonymous
  • anonymous
subtraction.
UsukiDoll
  • UsukiDoll
yes. just subtract 7 from both sides
anonymous
  • anonymous
7/7 7/0 =7
UsukiDoll
  • UsukiDoll
whoa we can't have 7/0 that's undefinded
anonymous
  • anonymous
Okay.
UsukiDoll
  • UsukiDoll
x+ 7 = 0 -7 -7 x+7-7 =0-7 what is 7-7 what's 0-7
anonymous
  • anonymous
-7?
UsukiDoll
  • UsukiDoll
woohoo!
UsukiDoll
  • UsukiDoll
so our two solutions are x= -7 and x =1/2
anonymous
  • anonymous
Alright do we plug them in or our we finish?
UsukiDoll
  • UsukiDoll
we're done
anonymous
  • anonymous
Thanks XD I am tired. Good night

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