Answer:
x = 120°
Step-by-step explanation:
We are given;
sec²x + 4secx = -4
Rearranging gives;
sec²x + 4secx + 4 = 0
Factorizing the left hand side gives;
(sec x + 2)(sec x + 2) = 0
This means that;
(sec x + 2) = 0
From trigonometry, we know that sec x = 1/cos x
Thus;
(1/cos x) + 2 = 0
1/cos x = -2
cos x = -1/2
cos x = -0.5
x = cos^(-1) -0.5
x = 120°
D because -4/5 has no variable such as m or r attached to it.
Answer:
![\displaystyle 4\sqrt[7]{x^3}](https://tex.z-dn.net/?f=%5Cdisplaystyle%204%5Csqrt%5B7%5D%7Bx%5E3%7D)
General Formulas and Concepts:
<u>Algebra I</u>
- Exponential Rule [Root Rewrite]:
![\displaystyle \sqrt[n]{x} = x^{\frac{1}{n}}](https://tex.z-dn.net/?f=%5Cdisplaystyle%20%5Csqrt%5Bn%5D%7Bx%7D%20%3D%20x%5E%7B%5Cfrac%7B1%7D%7Bn%7D%7D)
Step-by-step explanation:
<u>Step 1: Define</u>
<em>Identify</em>
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<u>Step 2: Rewrite</u>
- Split:

- Rewrite [Exponential Rule - Root Rewrite]:
![\displaystyle 4\sqrt[7]{x^3}](https://tex.z-dn.net/?f=%5Cdisplaystyle%204%5Csqrt%5B7%5D%7Bx%5E3%7D)
Answer:
3rd one
Step-by-step explanation:
the answer would be seven because seven to the 3rd power is 343 and cubed means that number multiplied by itself three times please mark braineist answer!