Unit 2
4 marks · EasyWrite 0.00052 in standard form. Then, substitute x = 4 into the expression .
(a)[2 marks]
Express 0.00052 in standard form.
(b)[2 marks]
Work out the value of when .
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 5.2 \times 10^{-4} · must show Correct coefficient and negative index
(b) 32 · must show Evaluates 2 × 4^2
Common mistakes: Getting the exponent of 10 wrong
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Marking points
A1 (a) · 2 marks · Correctly writes 0.00052 as 5.2 × 10^-4
A2 (b) · 2 marks · Substitutes and calculates 2 × 4^2 = 32
Worked solution
a) 0.00052 = 5.2 × 10^-4
b) For x = 4: 2 × (4^2) = 2 × 16 = 32