(a) Without using a calculator, work out the value of (4) 2 . (b) Press the following...

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(a) Without using a calculator, work out the value of (−4)2.
(b) Press the following key sequence on your calculator:
(-) 4 x2 

Explain carefully why this does not give the same result as part (a) and give an alternative key sequence that does give the correct answer.

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