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3 years ago

For the fiction f(x)=x^2+3x-28 solve the following f(x) = 0

Mathematics

1 answer:

vovikov84 [41]3 years ago

8 0

Answer:

$x=4\\\\x=-7$

Step-by-step explanation:

First, we need to set up the equation

$x^2+3x-28=0$

To solve this, we have two options: factoring or using the quadratic formula. In this case, factoring will work, so we can use that

To factor, we need to find two numbers that add together to give you 3 and multiply to give you -28

In this case, these two numbers would nee to be -4 and 7

This means that our factored equation would be:

$(x-4)(x+7)=0$

Now all we need to do is input the values of x that will give you 0. This means that the two solutions are

$x=4\\\\x=-7$

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3 years ago

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Ratling [72]

Answer:

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Step-by-step explanation:

The x-coordinate is listed first in an ordered pair. It is found on the horizontal scale. The point is on the grid line halfway between 6 and 8, so is presumed to have an x-coordinate of 7.

The y-coordinate is listed second in an ordered pair. It is found on the vertical scale. The point is on the grid line halfway between -4 and -6, so is presumed to have a y-coordinate of -5.

The coordinates of point A are (x, y) = (7, -5).

<em>Additional comment</em>

As in the case here, you will often run across graphs that don't have markings on every grid line You are expected to be able to figure out the value of a grid line based on the spacing of the marked lines.

It is a good idea to get familiar with reading coordinates of a point on a graph, as you will be doing it a lot.

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