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What is the line of symmetry for the parabola whose equation is y = -x2 + x + 3?

x = -1
x = -1/2
x = 1/2

2 Answers

0 votes

1/2 is correct, the formula to use is x= - b/2a :)

User Pietrorea
by
7.8k points
5 votes

Answer:


x = (1)/(2)

Explanation:

Given


y = -x^2 + x + 3

Required

The line of symmetry

This is calculated using:


x= -(b)/(2a)

Where:


y = ax^2 + bx + c

So, by comparison:


a = -1
b = 1
c = 3

So, we have:


x = -(1)/(2 * -1)


x = -(1)/(-2)


x = (1)/(2)

User Prasad Pawar
by
7.9k points

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