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nata0808 [166]
3 years ago
12

2x^2-4x-30 factored please. I m doing a test

Mathematics
1 answer:
bearhunter [10]3 years ago
4 0

Answer:

2(x+3)(x−5)

Step-by-step explanation:

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A square has an area of 100m^2 . What is the length of each side?
Lorico [155]

Answer:

10 meters

Step-by-step explanation:

The area of a square is found by

A = s^2 where s is the side length

100 = s^2

Take the square root of each side

sqrt(100) = sqrt(s^2)

10 =s

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An example of a qualitative statement would be:

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I really can't figure this out
Xelga [282]

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PLEASE HELP!!! I don’t understand
asambeis [7]

Answer:

Step-by-step explanation:

Use the half angle identity for cosine:

cos(x/2)=+ or - sqrt(1+cos(x))/sqrt(2)

I'm going to figure out the sign part first for cos(x/2)...

so x is in third quadrant which puts x between 180 and 270

if we half x, x/2 this puts us between 90 and 135 (that's the second quadrant)

cosine is negative in the second quadrant

so we know that

cos(x/2)=-sqrt(1+cos(x))/sqrt(2)

Now we need cos(x)... since we are in the third quadrant cos(x) is negative...

If you draw a reference triangle sin(x)=3/5 you should see that cos(x)=4/5 ... but again cos(x)=-4/5 since we are in the third quadrant.

So let's plug it in:

cos(x/2)=-sqrt(1+4/5)/sqrt(2)

No one likes compound fractions (mini-fractions inside bigger fractions)

Multiply top and bottom inside the square roots by 5.

cos(x/2)=-sqrt(5+4)/sqrt(10)

cos(x/2)=-sqrt(9)/sqrt(10)

cos(x/2)=-3/sqrt(10)

Rationalize the denominator

cos(x/2)=-3sqrt(10)/10

3 0
3 years ago
Please help me ! There's an attachment of the problem right here.
hichkok12 [17]

Answer:

12*12= 144 + 81= 225. 255/15= 15. Yes, this is a right triangle. I do not understand the question itself, but I hope this will help

Step-by-step explanation:

8 0
3 years ago
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