anonymous
  • anonymous
Solve for x. 2x^2 – 5x = 12
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
you really don't like maths do you..haha
anonymous
  • anonymous
no
anonymous
  • anonymous
nope :P I am really bad at it

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anonymous
  • anonymous
start with \[2x^2-5x-12=0\] then factor
anonymous
  • anonymous
well bring the 12 to the other side so 2x^2-5x-12=0 then use the quadratic formula
anonymous
  • anonymous
x=4,x=-1.5
anonymous
  • anonymous
you can use the quadratic formula, but a miracle occurs here and you can factor as \[(x-4)(2x+3)=0\]
anonymous
  • anonymous
whats the formula for the quadratic formula
anonymous
  • anonymous
|dw:1370482772355:dw|
anonymous
  • anonymous
where ax+bx+c=0
anonymous
  • anonymous
FOIL right?
anonymous
  • anonymous
so a=2 b=-5 c=-12 in this case
anonymous
  • anonymous
ok so... 2x+-5x+-12=0 -3x+12=0
anonymous
  • anonymous
so would the answer be (-3, 4)
anonymous
  • anonymous
|dw:1370483012595:dw|
anonymous
  • anonymous
|dw:1370483089226:dw|
anonymous
  • anonymous
|dw:1370483115728:dw|
anonymous
  • anonymous
|dw:1370483152782:dw|
anonymous
  • anonymous
therefore x=4 and x=-3/2
anonymous
  • anonymous
oh ok, i was close :)
anonymous
  • anonymous
haha keep trying

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