What is 64^(2/3)?

When the index of a number is a fraction such as 2/3, first take the cubic root, then square the number. For example:
641/3= cube root of 64(641/3)2 = 642/3
642/3 =( 641/3)2 = (4)2 = 16

Answered by James T. Maths tutor

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Factorise and solve x2 - 8x + 15 = 0


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