Find the integer x for which x^5 = 164916224
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Answer:
In decimal notation, the integers x and x ^5 have the same last digit.
∴ Last digit of x = 4.
1024 × 105 < 1649.16224 × 10 ^5 < 3125 × 10^5
40^5 < 1649.16224 × 10^5 < 50^5
So, 40 < x < 50
⇒ x = 44
Last digit of 4
∴ x = 44
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