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GenaCL600 [577]
3 years ago
7

What is the answer to -2r = -13

Mathematics
2 answers:
pantera1 [17]3 years ago
6 0

Answer:

6.5

Step-by-step explanation:

r= -13/-2

amid [387]3 years ago
4 0

Answer:  r=6.5

Step-by-step explanation:

-2r = -13

r = 13/2

r = 6.5

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12x+5=4x? Show steps, please.
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Answer:

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Step-by-step explanation:

4x = 12x + 5

4x - 12x = 5

-8x = 5

x = 5/-8

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3 years ago
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Step-by-step explanation:

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Need help with some inverse trigonometric expressions, rounded to the nearest degree.
rjkz [21]
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6 0
3 years ago
Which of the following is an extraneous solution of (45-3x)^1/2=x-9?
Iteru [2.4K]

Answer:

C. x =3

Step-by-step explanation:

Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.

Let's solve the equation first

\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6

Hence, we can conclude that x=3 is an extraneous solution of the equation ..

3 0
3 years ago
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