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3 years ago

Evaluate the function rule for the given value. f(x) = 3x for x = –5

Mathematics

2 answers:

Vikentia [17]3 years ago

7 0

Answer:

f(-5) = -15

Step-by-step explanation:

Put the value where x is and do the arithmetic.

f(-5) = 3(-5) = -15

The value of f(-5) is -15.

ra1l [238]3 years ago

6 0

Answer: f(-5)=-15

Knowing that x=-5, let’s substitute that into everywhere we see x in the equation

f(x)=3x

f(-5)=3(-5)

Now let’s solve that

f(-5)=-15

Hope this helps comment below for more questions :)

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9) PLS HELP W/QUESTIOOOON ASAP!!!:) BRAINLIEST AND 10 + POINTS

pav-90 [236]

Answer: -8

Explanation: so f(g(-1)) basically means f of g of -1. so we plug in -1 for x in g(x) and that equals 2(-1) + 5. so g(x) = 3. now we have f(3) because it’s f(g(-1)). f(3) = 1 - 3^2, which equals -8.

hope this helps!

5 0

3 years ago

Read 2 more answers

Cos (90-theta) • cosec90-theta) =tano. How?

denis-greek [22]

Answer:

______________________________________________________

TRIGONOMETRY IDENTITIES TO BE USED IN THE QUESTION :-

For any right angled triangle with one angle α ,

$\cos (90 - \alpha ) = \sin \alpha$ or $\sin(90 - \alpha ) = \cos\alpha$

$cosec \: (90 - \alpha ) = \sec\alpha$ or $\sec(90 - \alpha ) = cosec\:\alpha$

SOME GENERAL TRIGNOMETRIC FORMULAS :-

$\sin \alpha = \frac{1}{cosec \: \alpha }$ or $cosec \: \alpha = \frac{1}{\sin \alpha }$

$\cos \alpha = \frac{1}{\sec \alpha }$ or $\sec \alpha = \frac{1}{\cos \alpha }$

______________________________________________________

Now , lets come to the question.

In a right angled triangle , let one angle be α (in place of theta) .

So , lets solve L.H.S.

$\cos (90 - \alpha ) \times cosec(90 - \alpha )$

$=> sin\alpha \times \sec\alpha$

$=> \sin\alpha \times \frac{1}{\cos\alpha }$

$=> \frac{\sin\alpha }{\cos\alpha }$

$=> \tan\alpha$ = R.H.S.

∴ L.H.S. = R.H.S. (Proved)

3 0

3 years ago

Help me please with 3-111

LenKa [72]

Last Question

Because this may not be the question you want, I'll omit the first step which should be done with latex. The key to all of these except C is to invert the second fraction (turn the second fraction upside down) and multiply.

$\dfrac{6}{5} * \dfrac{-2}{3}$