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Zina [86]
3 years ago
14

How do you simplify (-4i)(7i)?

Mathematics
2 answers:
8090 [49]3 years ago
5 0

\bf (-4i)(7i)\implies -28i^2\implies \stackrel{\textit{recall that }i^2 = -1}{-28(-1)}\implies 28

xxTIMURxx [149]3 years ago
4 0

For this case we must simplify the following expression:

(-4i) (7i)

We have to by definition that:

- * + = -\\- * - = +\\i ^ 2 = -1

So:

-4i * 7i = -28i ^ 2 = -28 (-1) = 28

Finally we have that the expression is equivalent to:

(-4i) (7i) = 28

Answer:

(-4i) (7i) = 28

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Can anyone help me with this question please.
julsineya [31]
It’s d, because thats the formula !! mark me brainliest so I can help more people please !!
4 0
3 years ago
Find f(-2) f(x)=9x^2-5x+2
borishaifa [10]

Find f(-2) f(x)=9x^2-5x+2


f(-2) means replace x in the equation with -2:


f(-2)=9(-2)^2-5(-2)+2

= 9(4) +10 + 2

= 36 +10 + 2

= 48


f(-2) = 48



4 0
3 years ago
a scuba diver, who was 25 2/3 feet beneath the surface of the water, descended 5 1/2 feet. from this depth, how many feet must t
Effectus [21]

Answer:

31 1/6 feet

Step-by-step explanation:

add 25 2/3 to 5 1/2 to see how far under the surface he is; use common denominator of 6

25 4/6 + 5 3/6 = 30 7/6

30 7/6 is the same as 30 + 1 1/6 so diver must ascend 31 1/6 feet

6 0
3 years ago
Help me Guess just help please
Andrew [12]

Answer:

maybe 2 only?

Step-by-step explanation:

I'm just guessing but it sounds right

7 0
3 years ago
Read 2 more answers
What is the answer and steps to do it 45 +5/6x =50
Nookie1986 [14]
<span><span>Equation:- 45+<span><span>5/6 </span>x</span></span>=50
</span>1) Simplify both sides of the equation. <span><span><span><span>5/6 </span>x </span>+ 45 </span>= 50
</span>2) Subtract 45 from both sides. <span><span><span><span><span>5/6 </span>x </span>+ 45 </span>− 45 </span>= <span>50−45 </span></span><span><span><span>5/6 </span>x</span>=5
</span>3) Multiply both sides by 6/5.<span><span><span>(<span>6/5</span>)</span>*<span>(<span><span>5/6 </span>x</span>)</span></span>=<span><span>(<span>6/5</span>)</span>*<span>(5)</span></span></span><span>x=6

SO, x=6.
</span>
Hope I helped.
4 0
3 years ago
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