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Jet001 [13]
2 years ago
15

How do you Multiply Complex Numbers? I used a calculator that shows work and it mentioned something called the foil method which

gave -20+16i+15i+12 when I put (4-3i)(-5+4i). What is the foil method
Mathematics
1 answer:
lisabon 2012 [21]2 years ago
7 0

The FOIL method is the formula that is used when multiplying 2 binomials, where

(a+b)(c+d) = a(c+d) + b(c+d) =  ac + ad + bc + bd

Using the formula above, apply the foil method.

4(-5+4i) - 3i(-5+4i)

4(-5) + 4(4i) + (-3i(-5)) + (-3i(4i))

-20 + 16i + (15i) + (-12i^2)

-20 + 16i + 15i - 12i^2

Since i^2 = -1, then

-20 + 16i + 15i - 12(-1)

-20 + 16i + 15i + 12

Hope this helps.

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I NEED HELP!
Vinvika [58]

Answer:

Step-by-step explanation:

First of all you have to put the zeros into factor form.

y1 = (x + 2)(x - 5)

Notice that the x changes sigh. You say that the zeros are -2 and  5. To get y1 to go to zero, you must make x the opposite sign of what you are given.

Now you have to expand the factored form to get the standard form

y = x^2 + 2x - 5x - 10

y = x^2 - 3x - 10

That's not the right answer.

f(0) = 30 but you have - 10 at the end so you have to multiply the factored form by - 3

-3(f(x)) = -3(x + 2)(x - 5)

-3(f(x)) = -3(x^2 - 3x - 10)

f(x) = -3x^2 + 9x + 30    

f(0) = -3(0)^2 + 9(0) + 30

f(0) = 30

The quadratic still has roots of (x +2)(x - 5) but that 3 makes the y intercept = 30.

See the graph below.

6 0
3 years ago
What is the answer to my question
Vedmedyk [2.9K]
672 cm³
Step-by-step explanation:
10x7x9=630
2x3x7=42
630+42=672
5 0
3 years ago
Please helppp! &lt;3<br><br> y=2/5x-1 <br> in standard form!
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The standard form to y=2/5x-1 is: 2x-5y=5
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2 years ago
ASAP Evaluate the expression: 20.16(0.375)
SVETLANKA909090 [29]

Answer:

7.56

Step-by-step explanation:

Just multiply

20.16 times 0.375

7.56

6 0
2 years ago
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Which postulate or theorem proves that these two triangles are congruent?
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AAS they share a common side so it is congruent, the angles are given.

8 0
3 years ago
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