Qualification > Math

math in hl HELP

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sweet777:
thx....but umm..i guess i wrote it wrng...i meant dt using d 3 identities, prove that d Lhs=Rhs.....sry for writing it wrng :(

astarmathsandphysics:
Is the question answered?

IGSTUDENT:
Need some help in solving this equation:

k^3 = 2(k+8)^2

Ghost Of Highbury:
k..simple algebra

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first expand the right hand side and multiply it with 2

k3 = 2(k2 + 16k 64)

k3 = 2k2 + 32k + 128

now...get the right hand side to the left hand side

k3 - 2k2 - 32k - 128 = 0


solve the cubic equation to get the answer

k=8 ;

astarmathsandphysics:
I get the answers are complex numbers. Not nice ones either. Either the question is wrong or you have to use a numerical method. Can you check the question?

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