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Black_prince [1.1K]

2 years ago

15

07:38 On a coordinate plane, solid circles appear at the following points: (negative 4, 2), (negative 2, 2), (negative 1, 4), (1

, 1), (1, 3), (2, negative 3). Which ordered pair could be removed from the graph to create a set of ordered pairs that represents a function?

1 answer:

Sphinxa [80]2 years ago

3 0

Answer:

(-3,2)

Step-by-step explanation:

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Step-by-step explanation:

<u><em>The correct question is</em></u>

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

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in this problem we have

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so

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substitute

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<u><em>Verify</em></u>

Find the roots of the quadratic equation

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substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

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$x=\frac{10-50} {40}=-1$

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