if [1+ 1/x] = 12 , find the value of [x²+1/x²]
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answer is 142 because
x+1/x=12
squariring both sides
it will become identity
x²+2(x)(1/x)+(1/x)²=(12)²
x²+2+(1/x)²=144
x²+1/x²=144-2=142
x+1/x=12
squariring both sides
it will become identity
x²+2(x)(1/x)+(1/x)²=(12)²
x²+2+(1/x)²=144
x²+1/x²=144-2=142
swapy2911:
it says 1 + 1/x = 12 not x + 1/x
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