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kozerog [31]
3 years ago
11

If i^2 = −1 and a = (i + 7), which is the result of squaring a?

Mathematics
1 answer:
Artyom0805 [142]3 years ago
8 0

Answer:

48+14i

Step-by-step explanation:

So squaring (i+7) looks like this

(i+7)^2

(i+7)(i+7)

Use foil.

First: i(i)=i^2=-1

Outer: i(7)=7i

Inner: 7(i)=7i

Last: 7(7)=49

____________Add the terms.

48+14i

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What two numbers multiply to -50 and add up to -23
umka2103 [35]

Answer:

-25 and 2

Step-by-step explanation:

x + y = -23

xy = 50, so y = 50 /x

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x + 50/x =-23,  x^2 +23x - 50 = (x-2)(x+25)

so 2 and -25

4 0
2 years ago
Kim, Laura and Molly share £385
trapecia [35]
Set x equal to the amount of money Kim gets, and y for Molly's money.

 x = 2/5y, since the ratio is 2:5.
y = 105 + x, since Molly has 105 more pounds than Kim.

Substitute x into this equation, so that y = 105 + 2/5y. Subtract 2/5y from both sides to get 3/5y = 105. Divide each side by 0.6 (equivalent to 3/5) and you get y = 175, which is how much Molly has. Kim gets 2/5 of Molly's share (or 105 fewer pounds), so she has 70.

70 + 175 (Kim and Molly's shares) is equal to 245. Therefore, Laura receives the remaining 140 pounds.

140/385 = a/100
Cross multiply so that 385a is 14000. Divide by 385 to get 36.4 (rounded).

Thus, Laura receives about 36.4% of the total money. Hope this helps (:
5 0
3 years ago
The reciprocal of 4 3/7 is 7/31 true or false?
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False, it is 7/28
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7 0
2 years ago
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kakasveta [241]
Y=mx+b m=slope b=y intercept
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7 0
2 years ago
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I’ll give brainliest!!
nignag [31]

Answer:

If A is wrong then B I think

Step-by-step explanation:

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