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Maths-

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Question

Sage began graphing f(x) = -2x² + 4x + 9 by finding the axis of symmetry x = -1. Explain the error Sage made?

hint Hint:

For a quadratic function is in standard form, f(x)=ax2+bx+c.
Axis of symmetry x=−b/2a

The correct answer is: x = -1

We have given the equation f(x) = -2x² + 4x + 9
We will first find the axis of symmetry ‘
x = -b/ 2a
x = -4 / 2 (-2)
x = -4/ -4
x = 1
This detects the error made by sage that he finds axis of symmetry as x = -1

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