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a+b=6 and ab=8 then astraight a cubed plus straight b cubed=

Asked by Prakash 18th March 2018, 5:02 PM
Answered by Expert
Answer:
begin mathsize 16px style left parenthesis straight a plus straight b right parenthesis cubed equals straight a cubed plus 3 ab left parenthesis straight a plus straight b right parenthesis plus straight b cubed
According space to space the space question comma
straight a plus straight b equals 6 space and space ab equals 8
left parenthesis straight a plus straight b right parenthesis cubed equals straight a cubed plus straight b cubed plus 3 ab left parenthesis straight a plus straight b right parenthesis

6 cubed equals straight a cubed plus straight b cubed plus 3 cross times 8 cross times 6
straight a cubed plus straight b cubed equals 216 minus 144
straight a cubed plus straight b cubed equals 72 end style
Answered by Expert 19th March 2018, 9:40 AM
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