c) Solve this , its a question of EXPANSION IN ALGEBRA..
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Answer:
126/5
Step-by-step explanation:
add 2/5 on boyh sides
from this you can find that (x+1/5x) = 3
you need sum of cubes of them
so from a^3+b^3=(a+b)(a^2+b^2-ab)
take x as a
and 1/5x as b
you know both sum and product
get the answer
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