Graphs 5
2 marks · EasyWork out the value of y when x = -1 for the cubic function y = x^3 + 2x + 5.
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2 (±0)
Common mistakes: -2; -4; 6
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Marking points
M1 · 1 mark · Substitutes x = -1 into y = x^3 + 2x + 5.
A1 · 1 mark · Correct value y = 2.
Worked solution
Substitute x = -1 into y = x^3 + 2x + 5: