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My name is Ann [436]
2 years ago
9

If i = −1 and a and b are non-zero real numbers, what is 1a+bi ?

Mathematics
1 answer:
MariettaO [177]2 years ago
6 0
The i you normally think of (the one = to sqrt(-1) is not the same i they are using here. They are using this i the same way you would use x = - 1 in any normal equation or relation.

1a + b(-1)
a - b is your answer <<<< answer
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creativ13 [48]

Answer:

(15*x)+((25)(x-2))=230 THE ANSWER D. X=7

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Step-by-step explanation:

6 0
3 years ago
A multiplication problem is shown 789 times what equals 8679 what the missing number
navik [9.2K]

Answer:

789

Step-by-step explanation:

8679/789 = 11

5 0
3 years ago
4) Please help. <br> If MO=5x+34, and NO=−2(1−7x), what is the length of NO⎯⎯⎯⎯⎯⎯⎯⎯⎯?
Doss [256]

Answer:

The correct answer is 54.

5 0
3 years ago
Prove the function f: R- {1} to R- {1} defined by f(x) = ((x+1)/(x-1))^3 is bijective.
Eduardwww [97]

Answer:

See explaination

Step-by-step explanation:

given f:R-\left \{ 1 \right \}\rightarrow R-\left \{ 1 \right \} defined by f(x)=\left ( \frac{x+1}{x-1} \right )^{3}

let f(x)=f(y)

\left ( \frac{x+1}{x-1} \right )^{3}=\left ( \frac{y+1}{y-1} \right )^{3}

taking cube roots on both sides , we get

\frac{x+1}{x-1} = \frac{y+1}{y-1}

\Rightarrow (x+1)(y-1)=(x-1)(y+1)

\Rightarrow xy-x+y-1=xy+x-y-1

\Rightarrow -x+y=x-y

\Rightarrow x+x=y+y

\Rightarrow 2x=2y

\Rightarrow x=y

Hence f is one - one

let y\in R, such that f(x)=\left ( \frac{x+1}{x-1} \right )^{3}=y

\Rightarrow \frac{x+1}{x-1} =\sqrt[3]{y}

\Rightarrow x+1=\sqrt[3]{y}\left ( x-1 \right )

\Rightarrow x+1=\sqrt[3]{y} x- \sqrt[3]{y}

\Rightarrow \sqrt[3]{y} x-x=1+ \sqrt[3]{y}

\Rightarrow x\left ( \sqrt[3]{y} -1 \right ) =1+ \sqrt[3]{y}

\Rightarrow x=\frac{\sqrt[3]{y}+1}{\sqrt[3]{y}-1}

for every y\in R-\left \{ 1 \right \}\exists x\in R-\left \{ 1 \right \} such that x=\frac{\sqrt[3]{y}+1}{\sqrt[3]{y}-1}

Hence f is onto

since f is both one -one and onto so it is a bijective

8 0
3 years ago
If you subtract 426 from 913 how many times would you need to regroup? and how can you tell?
Eduardwww [97]
I need -487 time to regroup. i did 426 - 913 = -487
5 0
3 years ago
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