You know
Squaring both sides gives
Then raising both sides to any integer power gives
That is, any power of where the power is a multiple of 4 will always be equal to 1.
So
But perhaps you mean to write 20+1 as the exponent, in which case
Travis and his three friends ate out at Applebee's. Their bill totaled $72.50. If they left the server a 22%
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