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vitfil [10]
3 years ago
7

Let f(x)= (x^2+3x-4) and g(x)= (x+4)

Mathematics
2 answers:
RideAnS [48]3 years ago
8 0
I. Multiply the first function by the second one.
f(x)*g(x) = (x^2+3x-4)*(x+4) = x^3 + 3x^2 - 4x + 4x^2 + 12x -16 = x^3 +7x^2 + 8x - 16.
The domain of this new function is the set of all real numbers (R). Other notation: from minus infinity to plus infinity. We came to this conclusion because the new function poses no restrictions; regardless of which x-value you take, you will get the appropriate y-value.

II. f(x)/g(x) = (x^2+3x-4)/(x+4) =
Ask yourself: which two numbers add up to 3 and multiply to -4? It's -1 and 4. Now we can represent f(x) as (x-1)(x+4).
Since we're dividing these 2 brackets by g(x)=x+4, we may now cancel (x+4). All that's left is x-1.
The domain here is the same as in the previous task - it is R.
Llana [10]3 years ago
5 0
<h2>Answer:</h2>

Ques 1)

f(x)\cdot g(x)=x^3+7x^2+8x-16

  • The domain of f times g is all real numbers.

Ques 2)

\dfrac{f}{g}=\dfrac{x^2+3x-4}{x+4}

  • All real numbers except x= -4
<h2>Step-by-step explanation:</h2>

We are given two functions f(x) and g(x) as follows:

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

and

g(x)=x+4

1)

f\cdot g=f(x)\cdot g(x)\\\\i.e.\\\\f(x)\cdot g(x)=(x^2+3x-4)\cdot (x+4)\\\\i.e.\\\\f(x)\cdot g(x)=x^2(x+4)+3x(x+4)-4(x+4)\\\\i.e.\\\\f(x)\cdot g(x)=x^3+4x^2+3x^2+12x-4x-16\\\\i.e.\\\\f(x)\cdot g(x)=x^3+7x^2+8x-16

Also, we know that the polynomial function is defined everywhere,.

i.e. the domain of the polynomial function is all real numbers.

Hence, the domain of f times g is all real numbers.

2)

\dfrac{f}{g}=\dfrac{x^2+3x-4}{x+4}

The function f/g is a rational function .

The domain of a rational function is all real numbers except the point where denominator is zero.

Hence, the domain of f/g is:

All real numbers except x= -4

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pishuonlain [190]

Answer:

1. 2(3x−2)(2x−3)

2. 3(3x+1)(2x+5)

3. 2(4x+1)(2x−5)

4. 4(2x+1)(2x+7)

5. 5(3x+1)(2x−5)

6. 3(3x−7)(2x+1)

7. 3(5x+3)(3x−2)

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9. 2(7x−3)(2x−3)

10. 4(5x−11)(2x+1)

11. 5(x−2)(x+12)

12. (x−1)(x−8)

15. x=1 or x=4

Step-by-step explanation:

1. Factor 12x2−26x+12

12x2−26x+12

=2(3x−2)(2x−3)

2. 3(3x+1)(2x+5)

3. Factor 16x2−36x−10

16x2−36x−10

=2(4x+1)(2x−5)

4. Factor 16x2+64x+28

16x2+64x+28

=4(2x+1)(2x+7)

5. Factor 30x2−65x−25

30x2−65x−25

=5(3x+1)(2x−5)

6. Factor 18x2−33x−21

18x2−33x−21

=3(3x−7)(2x+1)

7. Factor 45x2−3x−18

45x2−3x−18

=3(5x+3)(3x−2)

8. Factor 28x2−78x+20

28x2−78x+20

=2(7x−2)(2x−5)

9. Factor 28x2−54x+18

28x2−54x+18

=2(7x−3)(2x−3)

10. Factor 40x2−68x−44

40x2−68x−44

=4(5x−11)(2x+1)

11. Factor 5x2+50x−120

5x2+50x−120

=5(x−2)(x+12)

12. Let's factor x2−9x+8

x2−9x+8

The middle number is -9 and the last number is 8.

Factoring means we want something like

(x+_)(x+_)

Which numbers go in the blanks?

We need two numbers that...

Add together to get -9

Multiply together to get 8

Can you think of the two numbers?

Try -1 and -8:

-1+-8 = -9

-1*-8 = 8

Fill in the blanks in

(x+_)(x+_)

with -1 and -8 to get...

(x-1)(x-8)

15. Let's solve your equation step-by-step.

(x−2)(x−3)=2

Step 1: Simplify both sides of the equation.

x2−5x+6=2

Step 2: Subtract 2 from both sides.

x2−5x+6−2=2−2

x2−5x+4=0

Step 3: Factor left side of equation.

(x−1)(x−4)=0

Step 4: Set factors equal to 0.

x−1=0 or x−4=0

x=1 or x=4

Sorry I wasn't able to do 13 and 14 but hope this helps! :)

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