Select all the equations where x=3 is a solution

Mathematics

2 answers:

Vinil7 [7]3 years ago

8 0

Answer:

the first , second, third,

Step-by-step explanation

x-3=0

add 3 on both sides you get 3 as the answer.

6=2x

divide 2 from both sides you get 3 as the answer

5x=15

divide 5 from both sides you get 3 as the answer

DanielleElmas [232]3 years ago

3 0

The first, second, and third answers are correct.

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3 years ago

Carmela made $270 working at a pet store last week. she worked a total of 30 hours. How much money did carmela make per hour?

olasank [31]

Answer:

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8 0

3 years ago

(3-4i)(6i+7)-(2-3i)

Sergeu [11.5K]

Answer:

43-7i

Step-by-step explanation:

We are given the expression:

$\displaystyle \large{(3 - 4i)(6i + 7) - (2 - 3i)}$

First, expand 3-4i in 6i+7. To expand binomial with binomial, first we expand 3 in 6i+7 then expand -4i in 6i+7.

$\displaystyle \large{[(3 \cdot 6i) + (3 \cdot 7) + ( - 4i \cdot 6i) + ( - 4i \cdot 7)]- (2 - 3i)} \\ \displaystyle \large{[18i + 21 - 24 {i}^{2} - 28i]- (2 - 3i)}$

Now combine like terms.

$\displaystyle \large{[ - 10i+ 21 - 24 {i}^{2} ]- (2 - 3i)}$

Imaginary Unit

$\displaystyle \large{i = \sqrt{ - 1} } \\ \displaystyle \large{ {i}^{2} = - 1 }$

Therefore:-

$\displaystyle \large{[ - 10i+ 21 - 24 ( - 1) ]- (2 - 3i)} \\ \displaystyle \large{[ - 10i+ 21 + 24]- (2 - 3i)} \\ \displaystyle \large{[ - 10i+ 45]- (2 - 3i)}$