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riadik2000 [5.3K]
3 years ago
7

I need some help with this calculus 1 question

Mathematics
1 answer:
Arada [10]3 years ago
4 0

Step-by-step explanation:

f(x) = x \sqrt{9 -  {x}^{2} }  \\  \therefore \: f(x) = \sqrt{9 {x}^{2}  -  {x}^{4} }  \\ \therefore \: f(x) = ({9 {x}^{2}  -  {x}^{4} } )^{ \frac{1}{2} }  \\ differentiating \: both \: sides \: w.r.t. \: x \\  {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\ \hspace{30 pt} \times (9 \times 2x - 4 {x}^{3} ) \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \\\hspace{32 pt}\times (18x - 4 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\\hspace{32 pt} \times 2(9x - 2 {x}^{3} )  \\  \therefore \: {f}^{'}(x) = ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \times (9x - 2 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{x({9 -  {x}^{2} } )^{   \frac{1}{2} } }  \times x(9 - 2 {x}^{2} )  \\  \\   \:  \:  \:  \:  \:  \: \red{ \boxed{ \bold{\therefore \: {f}^{'}(x) =  \frac{(9 - 2 {x}^{2} ) }{ \sqrt{{9 -  {x}^{2} }}}}}}

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svp [43]

Answer:

The American population was 20% of the British population.

Step-by-step explanation:

Let us call A the american population, B the British population before the migration, and x the population that migrated from America to Britannia.

Now, the population x that migrated was 20% of the american population:

(1).\: \: x = 0.2A,

and the same population x increase the British population by 4%:

x+B = 1.04B \\\\ (2). \:\:x = 0.04B.

Combining equation (1) and (2) we get:

0.2A = 0.04B

A = \dfrac{0.04B}{0.2}

\boxed{A = 0.2B}

Thus, the American population was 20% of the British population.

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3 years ago
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Answer:

2688x^2 + 3640x + 1225

Step-by-step explanation:

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Step-by-step explanation:

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Q1W7 Learning Task 1 (Introduction)
Tatiana [17]

Answer:

Column A                                            Column B

1. x² + 6x + 8                                        x-3,x+2

2. x³ - 7x + 6                                       x+1, x+2, x+3

3. x³ - 2x² - 5x + 6                              x-1, x+2, x-3

Step-by-step explanation:

Column A                                            Column B

1. x² + 6x + 8                                        x-3,x+2

2. x³ - 7x + 6                                       x+1, x+2, x+3

3. x³ - 2x² - 5x + 6                              x-1, x+2, x-3

Using Factor theorem we put values of x = ±1,±2,±3 in each of the polynomials unless we get a zero.

1. x² + 6x + 8      

= 1+6(1) +8= 15

1. x² + 6x + 8

  4+ 12+8 = 24

1. x² + 6x + 8

 (-1)² + 6(-1)+ 8

= 1-6+8= 3

1. x² + 6x + 8

 (-2)² + 6(-2)+ 8

= 4-12+8= 0

1. x² + 6x + 8

(3)²+ 6(3) +8

= 9+18+8 ≠ 0

1. x² + 6x + 8

(-3)²+ 6(-3) +8

= 9-18+8 =-1

For this polynomial we have x+2= 0 or x=-2, x-3= 0 , x=3

2. x³ - 7x + 6

1-7+6= 0

2. x³ - 7x + 6

(-1)³-7(-1) +6

= 13-1≠0

2. x³ - 7x + 6

(2)³-7(2) +6

= 8-14+6= 0

2. x³ - 7x + 6

(-2)³-7(-2) +6

= -8 +14+6

2. x³ - 7x + 6

(-3)³-7(-3) +6

= -27+21+6 = 0

For this polynomial we have x+1= 0 , x+2 = 0  and x+3= 0, or x=-1,-2,-3

3. x³ - 2x² - 5x + 6

(1)³-2(1)²-5(1)+6

= 0

3. x³ - 2x² - 5x + 6

(-1)³-2(-1)²-5(-1)+6

= -1 -2 +5+6

=8

3. x³ - 2x² - 5x + 6

(2)³-2(2)²-5(2)+6

= 8-8-10+6

=-4

3. x³ - 2x² - 5x + 6

(-2)³-2(-2)²-5(-2)+6

= -8-8+10+6

=0

3. x³ - 2x² - 5x + 6

(3)³-2(3)²-5(3)+6

= 27-18-15+6

=0

3. x³ - 2x² - 5x + 6

(-3)³-2(-3)²-5(-3)+6

= -27-18+15+6

=-14

For this polynomial we have x-1= 0 ,x+2=0, x-3= 0or x=1,-2,3

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3 years ago
Seven more then 3 rimes a number is 49
NikAS [45]
7 <span> more than 3 times a number </span>
<span>more than is code for + </span>
<span>times is multiply </span>
<span>so 7+3n=31 </span>

<span>solve: </span>
<span>3n=24 </span>
<span>n= 8</span>
6 0
3 years ago
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