JAMB 1990 · UME · Q29

Quadratics & their graphs

What is the equation of the quadratic function represented by the graph shown?

Worked solution (try it first)

The curve opens downward, so the $x^2$ term is negative: option C or D.
It crosses the $x$ -axis at $-1$ and 2, so $y = -(x + 1)(x - 2)$ .
Expand: $-(x^2 - x - 2) = -x^2 + x + 2$ , option D.

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