(3x+1/x)³ expand it and tell the formula
Answers
Answered by
0
Answer:
27x³ + 1/x³ + 9x²/x + 9x/x²
Step-by-step explanation:
Formula:
(a+b)³ = a³+b³+3a²b+3ab²
a=3x
b=1/x
(3x+1/x)³ = (3x)³ + (1/x)³ + 3(3x)²(1/x) + 3(3x)(1/x)²
= 27x³ + 1/x³ + 9x²/x + 9x/x²
Answered by
0
Answer:
(a+b)^3=a^3+3a^2b+3ab^2+b^3
where a=3x and b=1/x
hence,(3x+1/x)^3=(3x)^3+3*(3x)^2*1/x+3*3x*(1/x)^2+(1/x)^3
=27x^3+3*9x^2*1/x+3*3x*1/x^2+1/x^3
=27x^3+27x+9/x+1/x^3
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