The solution of the equation 1+a+a^2 +a^3 +...+a^x =(1+a)(1+a^2 )(1+a^4 ) is given by x = ____


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Question Number 56413 by gunawan last updated on 16/Mar/19

$The solution of the equation$ $1 + a + a^{2} + a^{3} + . . . + a^{x} = (1 + a) (1 + a^{2}) (1 + a^{4})$ $is given by x =_____.$
Commented by mr W last updated on 16/Mar/19

$l a s t t e r m o f L H S i s a^{x}$ $l a s t t e r m o f R H S i s a^{7}$ $\Rightarrow x = 7$
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