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solve-x-2-4x-5-7-




Question Number 24662 by NECx last updated on 24/Nov/17
solve ∣x^2 −4x−5∣=7
solvex24x5∣=7
Answered by mrW1 last updated on 24/Nov/17
x^2 −4x−5=±7  x^2 −4x+4=9±7  (x−2)^2 =9±7  (x−2)^2 =16    ...(i)  x−2=±4  x=2±4=−2, 6    (x−2)^2 =2    ...(ii)  x−2=±(√2)  x=2±(√2)=2+(√2), 2−(√2)
x24x5=±7x24x+4=9±7(x2)2=9±7(x2)2=16(i)x2=±4x=2±4=2,6(x2)2=2(ii)x2=±2x=2±2=2+2,22
Commented by NECx last updated on 24/Nov/17
thank you very much sir.
thankyouverymuchsir.
Commented by NECx last updated on 24/Nov/17
can the answers from an absolute  value also be represented in  intervals,if so please how can the  answer be represented.
cantheanswersfromanabsolutevaluealsoberepresentedinintervals,ifsopleasehowcantheanswerberepresented.
Commented by Joel578 last updated on 24/Nov/17
I think it couldn′t
Ithinkitcouldnt

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