All categories

2 years ago

If f(x) = 3x^2+x-2, then f(-2) =

Mathematics

1 answer:

Olin [163]2 years ago

3 0

Answer:

f(-2) =8

Step-by-step explanation:

f(x) = 3x^2+x-2

Let x = -2

f(-2) = 3 * (-2)^2 + (-2) -2

= 3(4) -2 -2

=12 -2-2

=10 -2

You might be interested in

Value of x is 3.2x-9.6=38.4?

Svetradugi [14.3K]

Answer:

The steps that can be done to both sides of the equation is: Add 9.6, then divide by 3.2

Step-by-step explanation:

Solve the equation:

$3.2x - 9.6 = 38.4$

-First you add both sides 9.6:

$3.2x -9.6 +9.6 = 38.4 +9.6$

$3.2x = 48$

-Then, you divide both sides by 3.2:

$\frac{3.2x}{3.2} = \frac{48}{3.2}$

$x=15$

7 0

2 years ago

Solve x2 - 8x - 9 = 0. Rewrite the equation so that it is of the form x2 + bx = c.

barxatty [35]

Answer:

x=9,-1 and $x^2+(-8)x=9$

Explanation:

we have been given with the quadratic equation $x^2-8x-9$

we compare the given quadratic equation with general quadratic equation

general quadratic is $ax^2+bx+c=0$

from given quadratic equation a=1,b= -8,c= -9

substituting these values in the formula for discriminant $D=b^{2}-4ac$

$D=(-8)^2-4(1)(-9)=100$

Now, to find the value of x

Formula is $x=\frac{-b\pm\sqrt{D}}{2a}$

Now, substituting the values we will get

$x=\frac{-(-8)\pm\sqrt{100}} {2}= \frac{8\pm10}{2}=9,-1$

And rewritting the given equation by shifting 9 to right hand side of the given equation and taking minus inside the bracket so as to convert it in the form of

$x^2+bx=c$

4 0

2 years ago

Read 2 more answers

What is the approximate perimeter of a rhombus with the diagonals that measure 12 feet and 18 feet

Fynjy0 [20]

Answer:

The perimeter of a rhombus with diagonals of 12 feet and 18 feet would be 60 feet.

Step-by-step explanation:

Perimeter of a rhombus: S1 + S2 + S3 + S4 = answer. (S stands for side.)

12 ft. + 18 ft. + 12 ft. + 18 ft. = 60 ft.

7 0

3 years ago

Which choice shows that “What was the purpose of the Inca’s strange strings?” Is a persuasive text?

podryga [215]

Answer:

Step-by-step explanation:

6 0

2 years ago

Triangle L J K is shown. Angle J L K is a right angle. The length of the hypotenuse is 15 inches and the length of the side adja

aleksklad [387]

Answer:

The answer is C: cos(x)= 10/15.

Step-by-step explanation:

ed2020

5 0

2 years ago

Read 2 more answers