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3 years ago

Given f (x) = 3x² – 7x + 1, what is f(-3)?

Mathematics

1 answer:

Law Incorporation [45]3 years ago

7 0

Answer:

Step-by-step explanation:

f(-3)= 3(-3)² - 7(-3) + 1

= 3(9) - (-21) + 1

= 27 + 21 + 1

=49

notes: negative × negative = positive

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For what values of x is x2-36=5x true?<br> 0 -9 and -4<br> O4 and 9<br> O4 and -9<br> o 9 and 4

mars1129 [50]

Answer:

-4 and 9

Step-by-step explanation:

we have

$x^{2} -36=5x$

we know that

The formula to solve a quadratic equation of the form

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

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2} -36=5x$

$x^{2}-5x-36=0$

$a=1\\b=-5\\c=-36$

substitute in the formula

$x=\frac{-(-5)(+/-)\sqrt{-5^{2}-4(1)(-36)}} {2(1)}$

$x=\frac{5(+/-)\sqrt{169}} {2}$

$x=\frac{5(+/-)13} {2}$

$x=\frac{5(+)13} {2}=9$

$x=\frac{5(-)13} {2}=-4$

therefore

The equation is true for -4 and 9

4 0

3 years ago

A graph titled Calories in Strawberries. The x-axis shows the number of strawberries, numbered 1 to 9, and the y-axis shows the

seraphim [82]

From the equation y = 4x, each strawberry contains 4 calories.

<h3>What is an equation?</h3>

An equation is an expression that shows the relationship between two or more numbers and variables.

Let y represent the number of calories in x strawberries. Hence:

y - 0 = [(27 - 0)/(6.8 - 0)](x - 0)

y = 4x

From the equation y = 4x, each strawberry contains 4 calories.

Find out more on equation at: brainly.com/question/2972832

#SPJ1

4 0

2 years ago

Help Please I Need Help

malfutka [58]

Answer:

1. first graph on the left side

2. first graph on the right side

3. second graph on the right side

4. last graph on the left side

Step-by-step explanation:

you use slope intercept form to figure this out

the m= the slope and b= the y intercept

5 0

4 years ago

ABC is isosceles with AB=AC=8 units and BC=6 units. D and E are midpoints of AB and BC respectively. Calculate the length of DE?

Allushta [10]

The triangle is drawn and is shown in the image attached with.

We get two similar triangles. Triangle ABC and Triangle ADE. Since the triangles are similar the ratio of their corresponding sides will be the same.

D and E are the midpoints of AB and BC, therefore, AD and AE are both 4 units in length. Using the property of similar triangles, we can say:

AD : DE= AB : BC
AD = 4 units
AB = 8 units
BC = 6 units
DE = unknown = x units

So,

$4 :x = 8 : 6 \\ \\ 
 \frac{4}{x} = \frac{8}{6} \\ \\ 
x=4* \frac{6}{8}=3 
$

Therefore, the length of DE will be 3 units

6 0

3 years ago

You mix soda water, fruit punch concentrate, and ginger ale in the ratio of 1 : 2 : 5 to make fruit punch. How many pints of eac

Solnce55 [7]

Well, there are 8 pints in gallon.

1+2+5= 1 gallon

1+2+5= 1 gallon

1+2+5= 1 gallon

1+2+5= 1 gallon
______________
4+8+20=4 gallons

4:8:20

4 0

3 years ago

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