Clermont298 Clermont298
  • 17-07-2014
  • Mathematics
Answered

Expanding Brackets when cubed eg
(x - 5)3 Answer given is xcubed -15xsquared + 75x -125 How do I work this? I can do two brackets but having trouble with the three brackets. Thanks



Answer :

Pulkit
Pulkit Pulkit
  • 19-07-2014
Solve like this - (x-5)^3
= (x-5)(x-5)^2
= (x-5) ( x^2 -10x + 25)
= x^3 -15x^2 + 75 - 125

Hope this helped
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