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masha68 [24]
3 years ago
14

Anyone know what a^2-2a-8=0 is

Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
5 0

Answer:

x = 4 or -2

Step-by-step explanation:

i couldn't write it here, so I added a photo

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Prove that :( 1 + 1/<img src="https://tex.z-dn.net/?f=tan%5E%7B2%7DA" id="TexFormula1" title="tan^{2}A" alt="tan^{2}A" align="ab
Aliun [14]

Answer:

See explanation

Step-by-step explanation:

Simplify left and right parts separately.

<u>Left part:</u>

\left(1+\dfrac{1}{\tan^2A}\right)\left(1+\dfrac{1}{\cot ^2A}\right)\\ \\=\left(1+\dfrac{1}{\frac{\sin^2A}{\cos^2A}}\right)\left(1+\dfrac{1}{\frac{\cos^2A}{\sin^2A}}\right)\\ \\=\left(1+\dfrac{\cos^2A}{\sin^2A}\right)\left(1+\dfrac{\sin^2A}{\cos^2A}\right)\\ \\=\dfrac{\sin^2A+\cos^2A}{\sin^2A}\cdot \dfrac{\cos^2A+\sin^A}{\cos^2A}\\ \\=\dfrac{1}{\sin^2A}\cdot \dfrac{1}{\cos^2A}\\ \\=\dfrac{1}{\sin^2A\cos^2A}

<u>Right part:</u>

\dfrac{1}{\sin^2A-\sin^4A}\\ \\=\dfrac{1}{\sin^2A(1-\sin^2A)}\\ \\=\dfrac{1}{\sin^2A\cos^2A}

Since simplified left and right parts are the same, then the equality is true.

3 0
3 years ago
The SAT mathematics scores in the state of Florida for this year are approximately normally distributed with a mean of 500 and a
creativ13 [48]
99.7%

This is because the likelihood of a point being within 2 SDs of the mean is 99.7%. 
7 0
3 years ago
I need help on this question
Over [174]

1 bushel = 186 heads of lettuces

multiply each side by 6

6 bushels = 1,116 heads of lettuces

The farmer picked 1,116 heads of lettuces

3 0
2 years ago
I need help on this. &amp; I'll give brainlyest to anyone who can solve it for me. Thank's!!!!
Olegator [25]

Answer:

I can helpyou with that but im not sure with it

6 0
2 years ago
I know its big...sorry for that, but i really need the awnsers -_-
BlackZzzverrR [31]

Answer:

#20 is irrational,  #24 is 33/100, and #25 is 0  

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
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