1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Dahasolnce [82]
3 years ago
8

Multiply the polynomials (x+4)(x^2-5x+3)

Mathematics
2 answers:
Vladimir79 [104]3 years ago
8 0

Answer:

\\ x^{3} - x^{2} - 17x + 12

Step-by-step explanation:

Write the polynomials one above the other to multiply them:

\\ x^{2} -5x + 3\\

         \\ x + 4\\

<h3 /><h3>First Step</h3>

Multiply each element of \\ x^{2} -5x + 3\\ by 4:

The result is: \\ 4x^{2} - 20x + 12 [1]

As it can be seen, only the coefficients are multiplied by 4, and when the operation involves multiplication with coefficients with different operators (+ or -), the following rules are crucial:  

\\ + * + = +

\\ - * - = +

\\ + * - = -

\\ - * + = -

That is why 4 times -5 = -20,  4 times 1 = 4, and so 4 times 3 = 12.

<h3 /><h3>Second Step</h3>

Multiply each element of \\ x^{2} -5x + 3\\ by x:

The same rules apply here, but including the addition of powers or exponents.

The result is: \\ x^{3} - 5x^{2} + 3x [2].

\\ x * x^{2} = x^{3} or \\ x * x^{2} = x^{1+2} =x^{3}

\\ x * (-5x)=-5x^{2}

\\ x*3 = 3x

<h3 /><h3>Third Step</h3>

Sum all similar terms of the previous results [1] and [2].

The result is: \\ x^{3}-x^{2}-17x +12, because

         \\ 4x^{2} - 20x + 12

\\ x^{3} - 5x^{2} + 3x

__________________________

\\ x^{3} + (4-5)x^{2} + (-20+3)x+12

\\ x^{3} + (-1)x^{2} + (-17)x+12

\\ x^{3} - x^{2} -17x+12.

tatiyna3 years ago
6 0
(<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(x<span> + </span>3)<span> 
</span>  =  (<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(x) + (<span>4x2</span><span> – </span><span>4x</span><span> – </span>7)(3)<span> 
</span><span>  =  </span><span>4x2</span>(x<span>) – </span><span>4x</span>(x<span>) – </span>7(x<span>) + </span><span>4x2</span>(3<span>) – </span><span>4x</span>(3<span>) – </span>7(3)<span> 
</span><span>  =  4x3 – 4x2 – 7x + 12x2 – 12x – 21</span><span> 
</span><span>  =  4x3 – 4x2 + 12x2 – 7x – 12x – 21</span><span> 
</span><span>  =  4x3 + 8x2 – 19x – 21</span>
You might be interested in
PLS PLS PLS HELP I WILL GIVE BRAINLIEST!
yKpoI14uk [10]

Answer:

A:6,2

Step-by-step explanation:

plz mark me as the brainliest

8 0
3 years ago
Read 2 more answers
you want to put $4000 in a simple interest account. it has a 2.5% annual interest rate. how long will it take you to earn $500 i
yaroslaw [1]
T=I/Pr
t:500/(4000*0.025)
t: 5 yrs
Dear Random17, the question to your answer requires the use of the formula I=Prt. The equation will look like 500=4000(0.025)t. Multiply 4000 times 0.025 to get 500=10t. T=50 years.

7 0
3 years ago
NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by h(t)=−4.9t2+121t
Alenkasestr [34]

NASA launches a rocket at t = 0 seconds. Its height, in meters above sea-level, as a function of time is given by

h(t)=-4.9t^2+121t+283

The sea level is represented by h = 0, therefore, to find the corresponding time when h splashes into the ocean we have to solve for t the following equation:

h(t)=0\implies-4.9t^2+121t+283=0

Using the quadratic formula, the solution for our problem is

\begin{gathered} t=\frac{-(121)\pm\sqrt{(121)^2-4(-4.9)(283)}}{2(-4.9)} \\ =\frac{121\pm142.083778...}{9.8} \\ =\frac{121+142.083778...}{9.8} \\ =26.8452834694... \end{gathered}

The rocket splashes after 26.845 seconds.

The maximum of this function happens at the root of the derivative. Differentiating our function, we have

h^{\prime}(t)=-9.8t+121

The root is

-9.8t+121=0\implies t=\frac{121}{9.8}=12.347

Then, the maximum height is

h(12.347)=1029.99

1029.99 meters above sea level.

6 0
1 year ago
Find the quotient of 3/5 and 2/3<br> Give your answer as a fraction in its simplest form.
maria [59]
The quotient is 9/10
6 0
2 years ago
Guys If you buy me a private island with a pterodactyl..:.. i’ll let you be in my Dino club for free :)
Vikki [24]

Ofc! Private island incoming...

️

5 0
3 years ago
Read 2 more answers
Other questions:
  • 2.) a. If you rotate an object 180 degrees clockwise or counterclockwise, using the same center, is the image the same in both c
    6·1 answer
  • Whats the answer for (9x - 6)
    5·1 answer
  • Find the value of x.
    7·1 answer
  • Two decreased by a half of a number is 1/2 of the number
    14·1 answer
  • Suppose a stat 121 professor would like to predict the mean final exam score of the students who obtained 80% on exam 3. What ki
    14·1 answer
  • Will give brainiest!!!////
    6·1 answer
  • I am a decimal
    9·1 answer
  • Solve for y.<br> -80 + y = 80<br> y=0<br> y=-160<br> y = 160
    15·1 answer
  • Hi my friend plays this game called Animal jam classic, all she's wanted was a membership, but her fam can't afford it, both of
    8·1 answer
  • Given the graph of the function f(x)=1/x2 write the equation g(x)
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!