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Nataly_w [17]
2 years ago
12

-8x+3(x-5)=25 solve for x literally i will give u points or whatever just get me an answer

Mathematics
2 answers:
Gnom [1K]2 years ago
7 0

Answer:

x= -8

Step-by-step explanation:

Nana76 [90]2 years ago
4 0

Answer:

x = -8

Step-by-step explanation:

-8x + 3(x - 5) = 25

Distribute the 3 into the (x - 5).

-8x + 3x - 15 = 25

Combine like terms.

-5x - 15 = 25

Add 15 to both sides.

-5x = 40

Divide both sides by -5.

x = -8.

Proof:

-8x + 3(x - 5) = 25

Substitute variable.

-8(-8) + 3((-8) - 5) = 25

Subtract inside parenthesis.

-8(-8) + 3(-13) = 25

Multiply -8 and -8.

64 + 3(-13) = 25

Multiply 3 and -13.

64 + (-39) = 25

Add 64 and -39.

25 = 25

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Answer:

1.3 * 10^5

Step-by-step explanation:

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3 years ago
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Suppose a and b are both non zero real numbers. Find real numbers c and d such that 1/a+ib= c+id
Thepotemich [5.8K]

\begin{gathered} c=\frac{a}{a^2+b^2} \\ d=\frac{-b}{a^2+b^2} \end{gathered}

Explanation

\frac{1}{a+bi}=c+di

Step 1

multiplicate by the conjugate

\begin{gathered} \frac{1}{a+bi}\cdot\frac{a-bi}{a+bi}=\frac{a-bi}{(a+bi)(a-bi)}=\frac{a-bi}{a^2-(bi)^2} \\ \frac{1}{a+bi}\cdot\frac{a-bi}{a+bi}=\frac{a-bi}{(a+bi)(a-bi)}=\frac{a-bi}{a^2-(-b^2)}=\frac{a-bi}{a^2+b^2} \end{gathered}

notice that

\begin{gathered} \frac{1}{a+bi}=\frac{a-bi}{a^2+b^2}=\frac{a}{a^2+b^2}-\frac{b}{a^2+b^2}i \\ \frac{a}{a^2+b^2}-\frac{b}{a^2+b^2}i=c+di \\ so \\  \end{gathered}\begin{gathered} c=\frac{a}{a^2+b^2} \\ d=\frac{-b}{a^2+b^2} \end{gathered}

I hope this helsp you

6 0
1 year ago
WILL GIVE BRAINLIEST!!!! it looks like an explanation but i just need an answer!!
Slav-nsk [51]

Answer:

5: 60

6: 30

Step-by-step explanation:

just a matter of multiplying all the possible values

5: 5 pants X 4 shirts X 3 shoes

6: 10 numbers (0-9) X 3 variations (right, left, right,)

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Which expression is equivalent to 1/2 x + (-70) - 2 1/4 x - (-2) *
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Answer:

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Step-by-step explanation:

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Please help me faster if know please?!!!!
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