All categories

3 years ago

Find the value of 3x³+2x²-4 at x=2

Mathematics

2 answers:

marusya05 [52]3 years ago

8 0

Answer: 20

Concept:

Here, we need to understand the idea of evaluation.

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

Given information

x = 2

Given expression

3x³ + 2x² - 4

Substitute values into the expression

3 (2)³ + 2 (2)² - 4

Simplify the exponenets

=3 (8) + 2 (4) - 4)

Simplify by multiplication

=24 + 8 - 4

Simplify by addition/subtraction

=32 - 4

= $\boxed{28}$

Hope this helps!! :)

Please let me know if you have any questions

Virty [35]3 years ago

5 0

Answer:

3(2) cube+2(2) square-4

24+8-4=28

You might be interested in

Show your work: convert 1/8 into a decimal

lukranit [14]

answer : 0.125

explanation: it’s actually really easy all you have to do is

take the fraction and divide it like :

1/8 = 1 divided by 8 = 0.125

3 0

2 years ago

A company sells a dried fruit mixture for $5 per pound. To make the mixture, banana chips that cost

ELEN [110]

Answer:

2.5 pounds

Step-by-step explanation:

Let s represent the number of pounds of dried strawberries that should be added to the bananas. The total cost of the mixture will be ...

(2.50)(3) +(8.00)(s) = (5.00)(3 +s)

7.50 +8s = 15 +5s . . . . . . . eliminate parentheses

3s = 7.50 . . . . . . . . . subtract 7.50+5s

s = 2.50 . . . . . . divide by 3

2.5 pounds of dried strawberries should be added to make the mixture.

6 0

2 years ago

Two sides of a triangle are 8 m and 9 m in length and the angle between them is increasing at a rate of 0.06 rad/s. Find the rat

Lelechka [254]

<h2>Rate at which area is increasing is 1.08 m²/s.</h2>

Step-by-step explanation:

Area of triangle is with side a and b and angle C between them is given by

A = 0.5 ab SinC

Here we need to find how area changes with a and b fixed and C is changing,

$\frac{dA}{dt}=\frac{d}{dt}\left (0.5 absinC\right )\\\\\frac{dA}{dt}=0.5ab\frac{d}{dt}\left (sinC\right )\\\\\frac{dA}{dt}=0.5abcosC\frac{dC}{dt}$

We have

a = 8 m

b = 9 m

$C=\frac{\pi}{3}rad\\\\\frac{dC}{dt}=0.06rad/s$

Substituting

$\frac{dA}{dt}=0.5\times 8\times 9\times cos\left ( \frac{\pi}{3}\right )\times 0.06\\\\\frac{dA}{dt}=1.08m^2/s$

Rate at which area is increasing is 1.08 m²/s.

4 0

3 years ago

a segment has and endpoint at (-6, 8). The midpoint is at (-6, 2). What are the coordinates of the other endpoint?

Montano1993 [528]

Answer:

(-6,-4)

Step-by-step explanation:

The first endpoint of the line is (-6,8), we can call

x_1 = -6

and

y_1 = 8

Let the last endpoint have coordinates (x_2,y_2)

Also, the midpoint formula is:

(x_1+x_2)/2 , (y_1+y_2)/2

Now, plugging these values is the formula, we get:

(-6+x_2)/2 = -6

-6+x_2=-12

x_2=-12+6 = -6

x_2 = -6

Also

(8+y_2)/2=2

8+y_2=4

y_2=4-8=-4

y_2 = -4

The coordinates of the other endpoint is (-6,-4)

8 0

3 years ago

27.64x3 estimate product

ki77a [65]

If you round up the 27.64 to 28 and then multiply it bye 3 it eaquals 84

6 0

3 years ago

Read 2 more answers

Find the value of 3x³+2x²-4 at x=2​

Find the value of 3x³+2x²-4 at x=2