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3 years ago

Which expression represents the sum of (2x-5y and (x+y) ?

Mathematics

1 answer:

gayaneshka [121]3 years ago

8 0

I have no clue you have to do something like x2-x1 over y1-y2 and you get yoyu answer from that.

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If x^2+1/x^2=3 find the value of x^2/(x^2+1)^2 Express answer as a common fraction. Thanks!!

timama [110]

$x^2+\dfrac1{x^2}=3\implies x^4+1=3x^2\implies x^4-3x^2+1=0$

By the quadratic formula,

$x^2=\dfrac{3\pm\sqrt5}2\implies x^2+1=\dfrac{5\pm\sqrt5}2$

Then

$(x^2+1)^2=\dfrac{25\pm10\sqrt5+5}4=\dfrac{15\pm5\sqrt5}2$

$\implies\dfrac{x^2}{(x^2+1)^2}=\dfrac{\frac{3\pm\sqrt5}2}{\frac{15\pm5\sqrt5}2}=\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}$

Multiply numerator and denominator by the denominator's conjugate:

$\dfrac{3\pm\sqrt5}{15\pm5\sqrt5}\cdot\dfrac{15\mp5\sqrt5}{15\mp5\sqrt5}=\dfrac{45\pm15\sqrt5\mp15\sqrt5-25}{15^2-(5\sqrt5)^2}=\dfrac{20}{100}=\dfrac15$

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3 years ago

2.34 is written as Help pls

Marina86 [1]

Answer: 2.34 is written as a decimal form.

Step-by-step explanation: two and thirty-four hundredths

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2 years ago

In 12 hours, how many more kilometers could the yellow car go than the red car? show your work

trasher [3.6K]

Answer:

144

Step-by-step explanation:

12 times 12

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2 years ago

An elevator went up 15 floors, down 9 floors, up 11 floors, and down 19 floors. Find the net change.

NARA [144]

Answer: The net change would be -2.

Step-by-step explanation: The upward change of elevator is represented by positive sign while the downward change represented by negative sign.

Given, First the elevator goes up 15 floors, change = + 15, Then it goes 9 floors down, change = -9, Then it goes 11 floors up,Change = + 11, Finally, it goes 19 floor down, Change = - 19 So, the net change = sum of total changes = 15 - 9 + 11 - 19 = -2

your welcome!

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2 years ago

Find the surface area of the cylinder in terms of pi.

Svet_ta [14]

I think the answer is c

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3 years ago

Read 2 more answers