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rewona [7]
3 years ago
8

Choose the correct simplification of (2x3 + x2 − 4x) − (9x3 − 3x2).

Mathematics
2 answers:
harina [27]3 years ago
8 0
2x^3 + x^2 - 4x - (9x^3 - 3x^2) =
2x^3 + x^2 - 4x - 9x^3 + 3x^2 =
-7x^3 + 4x^2 - 4x <===
Zielflug [23.3K]3 years ago
4 0

Answer:

option (2) is correct.

(2x^3+x^2-4x)-(9x^3-3x^2)=-7x^3+4x^2-4x

Step-by-step explanation:

Given  expression (2x^3+x^2-4x)-(9x^3-3x^2)

We have to choose the correct option that correctly simplify the given expression.

       

Consider the given expression (2x^3+x^2-4x)-(9x^3-3x^2)

Opening the brackets , we get,

Applying plus-minus rule, -(-a)=+a

(2x^3+x^2-4x)-(9x^3-3x^2)=2x^3+x^2-4x-9x^3+3x^2

LIKE TERMS are terms having same variable with same degree.

Adding like term , we get,

(2x^3+x^2-4x)-(9x^3-3x^2)=(2-9)x^3+(3+1)x^2-4x

(2x^3+x^2-4x)-(9x^3-3x^2)=-7x^3+4x^2-4x

Thus, option (2) is correct.

You might be interested in
The function y = x 2 - 10x + 31 has a ____
katrin [286]

Answer:

Option B. minimum is correct for the first blank

Option C. 6 is correct for second blank.

Step-by-step explanation:

In order to find the maxima or minima of a function, we have to take the first derivative and then put it equal to zero to find the critical values.

Given function is:

f(x) = x^2-10x+31

Taking first derivative

f'(x) = 2x-10

Now the first derivative has to be put equal to zero to find the critical value

2x-10 = 0\\2x = 10\\x = \frac{10}{2} = 5

The function has only one critical value which is 5.

Taking 2nd derivative

f''(x) =2

f''(5) = 2

As the value of 2nd derivative is positive for the critical value 5, this means that the function has a minimum value at x = 5

The value can be found out by putting x=5 in the function

f(5) = (5)^2-10(5)+31\\=25-50+31\\=6

Hence,

<u>The function y = x 2 - 10x + 31 has a minimum  value of 6</u>

Hence,

Option B. minimum is correct for the first blank

Option C. 6 is correct for second blank.

8 0
3 years ago
A stool of ribbon holds 6.75 meters.A craft club buys 21 stools. What is the total cost if the ribbon sells for $2 per meter.
OLEGan [10]

283.5

So you multiply 6.75 by 21 stools to find the total number of meters. Then you multiply that by 2.

7 0
3 years ago
Simplify using the rules of rational exponents
kaheart [24]
I should answere should be C
7 0
3 years ago
A ​$240 suit is marked down by ​30%. Find the sale price.
Alona [7]

Answer:

184.62$

Step-by-step explanation:

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8 0
2 years ago
Read 2 more answers
PLEASE HELP ASAP. RIGHT ANSWER WILL GET BRAINLIEST
dimulka [17.4K]
Given
P(1,-3); P'(-3,1)
Q(3,-2);Q'(-2,3)
R(3,-3);R'(-3,3)
S(2,-4);S'(-4,2)

By observing the relationship between P and P', Q and Q',.... we note that
(x,y)->(y,x)  which corresponds to a single reflection about the line y=x.
Alternatively, the same result may be obtained by first reflecting about the x-axis, then a positive (clockwise) rotation of 90 degrees, as follows:
Sx(x,y)->(x,-y)    [ reflection about x-axis ]
R90(x,y)->(-y,x)    [ positive rotation of 90 degrees ]
combined or composite transformation
R90. Sx (x,y)-> R90(x,-y) -> (y,x)

Similarly similar composite transformation may be obtained by a reflection about the y-axis, followed by a rotation of -90 (or 270) degrees, as follows:
Sy(x,y)->(-x,y)
R270(x,y)->(y,-x)
=>
R270.Sy(x,y)->R270(-x,y)->(y,x)

So in summary, three ways have been presented to make the required transformation, two of which are composite transformations (sequence).
4 0
3 years ago
Read 2 more answers
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