JAMB - Mathematics (1990 - No. 39)

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

y = x² + x - 2

y = -x² - x + 2

y = x² - x - 2

y = -x² - x + 2

Explanation

The required equation is y = x² - x - 2

i.e. B where the graph touches the graph touches the x-axis y = 0

x² - x - 2 = 0 = (x + 1)(x - 2) = 0

Hence roots of the equation are -1 and 2 as shown in the graph

JAMB - Mathematics (1990 - No. 39)

Explanation

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