Write 16× 8^2x as a power of 2 in terms of x.

16 = 2482x = (23)2x = 26xTherefore, 16x82x = 24x 26x = 24+6x

Answered by Xixi Y. Maths tutor

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Jo wants to work out the solutions of x^2 + 3x – 5 = 0 She says, ‘‘The solutions cannot be worked out because x^2 + 3x – 5 does not factorise to (x + a)(x + b) where a and b are integers.’’ Is Jo correct?


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