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Olin [163]
2 years ago
15

A kite is flying at an angle of elevation of 48º. Find the height of the kite if 39 ft of the string have been let out.​

Mathematics
1 answer:
Naddika [18.5K]2 years ago
5 0
A kite is flying at an angle of elevation of 48 degrees
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Penelope determined the solutions of the quadratic function by completing the square. F(x) = 4x2 8x 1 –1 = 4x2 8x –1 = 4(x2 2x)
Ymorist [56]

By solving the quadratic equation using completing the square method we got that Penelope should have added 4 to both sides instead of adding 1.

<h3>What is quadratic equation ?</h3>

Any equation of the form ax^2+bx+c=0 where x is variable and a, b, and c are any real numbers where a ≠ 0 is called quadratic equation .

Given work of Penelope is

$$\begin{aligned}&f(x)=4 x^{2}+8 x+1 \\&-1=4 x^{2}+8 x \\&-1=4\left(x^{2}+2 x\right) \\&-1+1=4\left(x^{2}+2 x+1\right) \\&0=4(x+2)^{2} \\&0=(x+2)^{2} \\&0=x+2 \\&-2=x\end{aligned}$$

Now we can see that Penelope determined the solutions of the quadratic function by completing the square. so he must have been done as following

$$\begin{aligned}&f(x)=4 x^{2}+8 x+1 \\&-1=4 x^{2}+8 x \\&-1=4\left(x^{2}+2 x\right) \\&-1+4=4\left(x^{2}+2 x+1\right) \\&3=4(x+2)^{2} \\&\frac{3}{4} =x+2)^{2} \\&\frac{\pm\sqrt3}{2} =x+2 \\&\frac{-2\pm\sqrt3}{2} =x\end{aligned}$$

By solving the quadratic equation using completing the square method we got that Penelope should have added 4 to both sides instead of adding 1.

To learn more about quadratic equations visit : brainly.com/question/1214333

8 0
2 years ago
How should I choose stocks?
Art [367]
One way to choose stocks is by customers demand
4 0
3 years ago
Which expression is equivalent to<br> %?
olganol [36]

Answer:

x^{\frac{2}{3} }

Step-by-step explanation:

⇒ x^({\frac{4+2}{3}) } ^{\frac{1}{3} }

⇒ (x^{\frac{6}{3} })

⇒ (x^{2} )\frac{1}{3}

⇒ x^{\frac{2}{3} }

8 0
2 years ago
PLEASE HELP!! WILL GIVE CROWN. ZOOM INTO PICTURE IF NEED TO SEE​
Korolek [52]

Answer:

k= -4

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Use the substitution method to solve.<br><br> y=5−3x<br> 5x−4y=−3
Vadim26 [7]
Well just substitute y (the first equation) into the second equation.
So
5x-4(5-3x)=-3
Then just solve the equation from there.
5x-20+12x=-3
17x=17
x=1
and if you need y, y=2
6 0
3 years ago
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