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Greeley [361]
4 years ago
7

6xy2(3y-x)-3x2(x-3y)2

Mathematics
1 answer:
OverLord2011 [107]4 years ago
7 0

Answer:6xy2(3y-x)-3x2(x-3y)2

Final result :

3x • (3y - x) • (x2 - 3xy - 2y2)

Step by step solution :

Step 1 :

Equation at the end of step 1 :

((6x•(y2))•(3y-x))-(3x2•(x-3y)2)

Step 2 :

Equation at the end of step 2 :

((6x•(y2))•(3y-x))-3x2•(x-3y)2

Step 3 :

Equation at the end of step 3 :

((2•3xy2) • (3y - x)) - 3x2 • (x - 3y)2

Step 4 :

Equation at the end of step 4 :

(2•3xy2) • (3y - x) - 3x2 • (x - 3y)2

Step 5 :

Pulling out like terms :

5.1 Pull out 3y-x

Note that x-3y =(-1)• 3y-x

After pulling out, we are left with :

(3y-x) • ( 2 • 3xy2 * (-1) +( 3x2 * (x-3y) ))

Step 6 :

Pulling out like terms :

6.1 Pull out like factors :

3x3 - 9x2y - 6xy2 = 3x • (x2 - 3xy - 2y2)

Trying to factor a multi variable polynomial :

6.2 Factoring x2 - 3xy - 2y2

Try to factor this multi-variable trinomial using trial and error

Factorization fails

Final result :

3x • (3y - x) • (x2 - 3xy - 2y2)

Step-by-step explanation:

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Points B, D, and F are midpoints of the sides of ΔACE. EC = 38 and DF = 16. Find AC. The diagram is not to scale.
Lunna [17]

Answer: The measure of AC is 32.

Explanation:

It is given that the Points B, D, and F are midpoints of the sides of ΔACE. EC = 38 and DF = 16.

The midpoint theorem states that the if a line segments connecting two midpoints then the line is parallel to the third side and it's length is half of the third side.

Since F and D are midpoints of AE and EC respectively.

So by midpoint theorem length of AC is twice of DF.

AC=2\times DF

AC=2\times 16

AC=32

Therefore, the length of AC is 32.

7 0
3 years ago
If sinA =3/5 and A+B =90 find cosB
-Dominant- [34]

A+B=90^o\to B=90^o-A\\\\\cos B=\cos(90^o-A)=\cos90^o\cos A+\sin90^o\sin A\\\\=\cos A+1\cdot\dfrac{3}{5}=0+\dfrac{3}{5}=\dfrac{3}{5}\\\\\boxed{\cos B=\dfrac{3}{5}}

Used:\\\\\cos(x+y)=\cos x\cos y+\sin x\sin y\\\\\cos90^o=0,\ sin90^o=1

Other method:

Look at the picture.

\sin\theta=\dfrac{opposite}{hypotenuse}\\\\\sin A=\dfrac{3}{5}\to opposite=3\ and\ hypotenuse=5

\cos\theta=\dfrac{adjacent}{hypotenuse}\\\\adjacent=3\ and\ hypotenuse=5\to\cos B=\dfrac{3}{5}

8 0
3 years ago
A cube has a height of 7 cm. What is the volume of the cube?
WITCHER [35]

Answer:

343

Step-by-step explanation:

if you have a cube, then the volume is one of the sides cubed, or to the third power. 7^3 can be represented as 7*7*7, or 7x7x7, which is 343.

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3 years ago
−21x + 121; x= 5<br> Help Me!!
NeTakaya

Answer:

16

Step-by-step explanation:

-21x+121

x=5

substitute x

-21(5)+121=-105+121=16

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3 years ago
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If x &lt;.-4 what must be true?
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Answer:

x{-5,-6,-7.....,-infinity} so no.c)x is to the left of -4 on number line

Hope it helps

8 0
3 years ago
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