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3 years ago

Which answer shows this equation written in standard form?

1 answer:

5 0

So first we solve and simplify
pemdas
first parenthasees

9-4(x-y)=-6x+6
distribute using distributeive property of multiplication which is a(b+c)=(ab)+(ac)

so -4(x-y)=-4x+4y

9-4x+4y=-6x+6
add 6x to both sides
9+2x+4y=6
subtract 9 from both sides
2x+4y=-3
only B matches this
B is the correct answer

(I don't know what standard form is but I know what simplified is)

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13....................

Mashcka [7]

13.

(a)

$y=-5x^2+21x-3$

for x = 2:

$y=-5(2)^2+21(2)-3=-20+42-3=19$

for x = 5

$y=-5(5)^2+21(5)-3=-125+105-3=-23$

(b)

The graph is:

(c)

Using the graph:

$\begin{gathered} x=1.8,y=18.6 \\ x=0.548,y=7 \\ x=3.65,y=7 \end{gathered}$ $\begin{gathered} x=1.8 \\ y=-5(1.8)^2+21(1.8)-3=-16.2+37.8-3=18.6 \end{gathered}$ $\begin{gathered} y=7 \\ -5x^2+21x-3=7 \\ -5x^2+21x-10=0 \end{gathered}$

Using the quadratic formula:

$\begin{gathered} x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a} \\ x=\frac{-21\pm\sqrt[]{21^2-4(-5)(-10)}}{2(-5)} \\ x=\frac{-21\pm\sqrt[]{241}}{-10} \\ x=0.54758 \\ or \\ x=3.6524 \end{gathered}$

6 0

10 months ago

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Radda [10]

Answer:

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4 0

3 years ago

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F(x)= x+4; D: {-5, -3, 0, 4}

Vika [28.1K]

Step-by-step explanation:

-5+4=-1

-3+4=1

0+4=4

4+4=8

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3 years ago

I think of a number, multiply it by three, and add four. I get twenty two.

melomori [17]

Step-by-step explanation:

3x+4=22

3x=22-4

3x=18

x=18/3

x=6

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2 years ago

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harkovskaia [24]

The correct answer for this question is this one: "2.5"
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Hope this helps answer your question and have a nice day ahead.

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3 years ago

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