Maths-

General

Easy

Question

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

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) = -2x^{2} + 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

This detects the error made by sage that he finds axis of symmetry as x = -1

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