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If 1 + 9r2 + 81r4 = 256 and 1 +...

This question belongs to Arithmetic Ability Algebra
Algebra
?

If 1 + 9r2 + 81r4 = 256 and 1 + 3r + 9r2 = 32, then find the value of 1 - 3r + 9r2.

Answer & Solution
Correct Answer: Option A
1 + 9r2 + 81r4 = 256
1 + 3r + 9r2 = 32
So, 1 - 3r + 9r2 $$ = \frac{{256}}{{32}} = 8$$
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