This is how to solve this problem :)
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5x^2+30x+65=0
5 (x^2+6x+13)=0
x^2+6x+13=0
a=1 b=6 c=13
disctirminant=b^-4ac
disctirminant=6^2-4.1.13
disctirminant=36-52
disctirminant= -16
x1= -6+square root of -16/2.1
x1= -6+4i/2=2i-3
x2= -6- square root of -16/2.1
x2= -6-4i/2= -3-2i
Is there a sort of graph that I could look at and then I could tell, because I don’t just know this information off the top of my head.
The thickness of the non-reflective coating layer is 9.62 x 10¯⁸ m or 96.2 nm.
From the question we know that :
n = 1.30
λ = 500nm = 5 x 10¯⁷m
The non-reflective coating system is applied on glass and the refractive index of that system should be <em>nair</em> < <em>ncoating</em> < <em>nglass. </em>The light travels across the air and is refracted by coating film and then refracted again by the glass. For preventing the light got reflected by glass, the thickness of the layer should obey this equation :
2nt = λ/2
t is the thickness of the layer, λ is the wavelength and n is the refractive index of the film.
By substituting the following equation we get
2nt = λ/2
t = 1/4 . ( λ / n )
t = 1/4 . ( 5 x 10¯⁷ / 1.3)
t = 9.62 x 10¯⁸ m
Hence, the thickness of the non-reflective coating layer is 9.62 x 10¯⁸ m or 96.2 nm.
Find out more on non-reflective coating at: brainly.com/question/17205515
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Answer:
A) 7x + 3y = -8
B) -4x - y = 6 Multiplying B) by 3
B) -12x -3y = 18 then we add A)
A) 7x + 3y = -8
-5x = 10
x = 2
y = -2
Answer is the first one (2, -2)
Step-by-step explanation:
