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elena-14-01-66 [18.8K]
3 years ago
9

Guys please help me with this please, please

Mathematics
2 answers:
Natali5045456 [20]3 years ago
4 0

what is that I think that is a fraction?

Crank3 years ago
3 0
Answer would be C )

Hope it helps :)
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What are the types of roots of the equation below? x^4 - 81 = 0
blsea [12.9K]
Your answer is B, two complex roots and two real roots.

By factoring the original equation(which is a difference of two squares), you get:
x^{4}-81=0\\(x^{2}-9)(x^{2}+9)=0

Because first root is also a difference of two squares, it factors into x - 3 and x +3, your two real roots.
When you factor the second root, the roots are x - 3i and x + 3i.

To prove this, let's multiply them back together:
[(x-3)(x+3)][(x-3i)(x+3i)]=0\\\\(x^{2}+3x-3x-9)(x^{2}+3xi-3xi-9i^{2})=0\\\\(x^{2}+0x-9)(x^{2}+0xi-9(-1))=0\\\\(x^{2}-9)(x^{2}+9)=0\\\\x^{4}+9x^{2}-9x^{2}-81=0\\\\x^{4}-81=0

We reached the equation we started with, so that means that the roots are:
x + 3,
x - 3,
x + 3i, and
x - 3i,
two of which are real and two are complex.
7 0
3 years ago
What is Add and Simply 7/4 + 5/6 =
Pani-rosa [81]
Simple, first find a common denominator, 24.

So,

7/4*6= 42/24
and
5/6*6=30/24

Then just add, 

42/24
+
30/24

Making it 72/24.

72/24=3

Thus, your answer is, 3.

5 0
3 years ago
Solve 9y-4x-9=0 steps and answer please
luda_lava [24]
Step 1: Add 9 to both sides.<span><span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>−9</span>+9</span>=<span>0+9</span></span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>=9</span>Step 2: Add -9y to both sides.<span><span><span><span>−<span>4x</span></span>+<span>9y</span></span>+<span>−<span>9y</span></span></span>=<span>9+<span>−<span>9y</span></span></span></span><span><span>−<span>4x</span></span>=<span><span>−<span>9y</span></span>+9</span></span>Step 3: Divide both sides by -4.<span><span><span>−<span>4x</span></span><span>−4</span></span>=<span><span><span>−<span>9y</span></span>+9</span><span>−4</span></span></span><span>x=<span><span><span>94</span>y</span>+<span><span>−9</span>4</span></span></span>Answer:<span>x=<span><span><span>94</span>y</span>+<span><span>−9</span><span>4</span></span></span></span>
3 0
3 years ago
Read 2 more answers
Samuel purchased 212 pounds of nuts for $10.50.
kirill115 [55]

Answer:

$22.05

Step-by-step explanation:

2 1/2/10.5=5 1/4/x

55.125=2 1/2x

x=22.05

Hope this helps plz hit the crown :D

7 0
3 years ago
Read 2 more answers
Please help if anyone can
liubo4ka [24]
So copy the url of that into another tab and then go to the question, go back to the original guess all and final check it it will show the correct answer. Now take that answer and put it in the copy rang you made and vuala
4 0
4 years ago
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