Paper 2 · November 2011 (topical set) · Functional Graphs

For the graph of y = x^3, calculate the value of y when x = 2,5.

Model answer

15,625

Also accepted: 15,63, 15,6

Explanation

Cubing means multiplying the number by itself three times. y = 2,5 x 2,5 x 2,5. First 2,5 x 2,5 = 6,25, then 6,25 x 2,5 = 15,625. So the point (2,5; 15,625) lies on the curve, between the plotted points (2; 8) and (3; 27).

ZIMSEC Mathematics 4008/2, November 2011, Q8(a), via the Topical Collection

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