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3 years ago

Evaluate the expression 2x^2 - x, when x = -3. Show all steps.

Mathematics

2 answers:

Alex_Xolod [135]3 years ago

5 0

Answer:

Step-by-step explanation:

2x² - x

2(-3)² - (-3)

2(9) + 3

18 + 3

V125BC [204]3 years ago

4 0

Answer:

Step-by-step explanation:

This is a substitution question,we are to substitute a given value in place of a certain letter

So let's solve

2x^2-x

And since x is given to be -3

So let's substitute

2(-3)^2-(-3)

2(9)-(-3)

18+3

So the final answer is 21

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2 years ago

Find the equation of the inverse.<img src="https://tex.z-dn.net/?f=y%20%3D%20%20%7B2%7D%5E%7Bx%20%2B%205%7D%20%20-%206" id="TexF

Contact [7]

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we have

$y=\mleft\{2\mright\}^{\mleft\{x+5\mright\}}-6$

step 1

Exchange the variables

x for y and y for x

$x=\{2\}^{\{y+5\}}-6$

step 2

Isolate the variable y

$(x+6)=2^{(y+5)}$

apply log both sides

$\begin{gathered} \log (x+6)=(y+5)\cdot\log (2) \\ y+5=\frac{\log (x+6)}{\log (2)} \\ \\ y=\frac{\log(x+6)}{\log(2)}-5 \end{gathered}$

step 3

Let

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1 year ago

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kari74 [83]

Answer:

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Step-by-step explanation:

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3 years ago

Read 2 more answers