anonymous
  • anonymous
factor 2a^2-a-1
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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lgbasallote
  • lgbasallote
(2a+1)(a-1)
anonymous
  • anonymous
can u help me with a trig equation questioon also

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apoorvk
  • apoorvk
|dw:1332636999541:dw|
apoorvk
  • apoorvk
yeah plz ask
lgbasallote
  • lgbasallote
shoot
anonymous
  • anonymous
okay here is the question what is the genral solution for cos^2x+5cosx-6
anonymous
  • anonymous
ill draw it for you
anonymous
  • anonymous
|dw:1332640818539:dw|
lgbasallote
  • lgbasallote
let cosx = u u^2 + 5u -6 = 0 (u-1)(u+6) u = 1 u = -6 so... cosx = 1 cosx = -6 are you looking for x??
anonymous
  • anonymous
yes the value in radians
anonymous
  • anonymous
couldntb it also be 3 and 2
lgbasallote
  • lgbasallote
no...cos you see (u+3)(u+2) will either give you positive 5 and a positive 6...or a negative 5 and positive 6..either way...6 will not become negative
anonymous
  • anonymous
so whts the value in radians
lgbasallote
  • lgbasallote
maybe taking their arc cosines? so x = 0; arc cosx cannot be equal to -6 since it is limited to -1 and to 1...so x = 0 is the only answer,,,however i do not know if that is radians...not sure
anonymous
  • anonymous
oh and this question too 3sinx -x squared plus 1
lgbasallote
  • lgbasallote
i dont know how to solve that o.O sorry

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