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jonny [76]
3 years ago
7

Which quadratic expression is written in standard form?

Mathematics
1 answer:
erastovalidia [21]3 years ago
4 0

Answer:

C.

Step-by-step explanation:

-x^2 - 5x + 7.

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If a rectangle has an area of x^2+x-20 and a width of x-4, what is the length?
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Answer:

This (x - 5) represents the length of the rectangle.

Step-by-step explanation:

The formula for the area of a rectangle of length L and width W is A = L * W.

Here, the width is x - 4 and the area is x^2 + x - 20.  Dividing the width (x - 4) into the area results in an expression for the length:

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Let's use synthetic division here.  It's a little faster than long division.

If the divisor in long division is x - 4, we know immediately that the divisor in synthetic division is 4:

4   /   1    1    -20

              4     20

    --------------------

         1     5     0

This synthetic division results in a remainder of 0.  This tells us that 4 (or the corresponding (x - 4) is indeed a root of the polynomial x^2 + x - 20, and so *(x - 4) is a factor.  From the coefficients 1 and 5 we can construct the other factor:  (x - 5).  This (x - 5) represents the length of the rectangle.

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Evaluate for x=4 and y=-3 write in simplest form<br> 2y/x2
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Hello from MrBillDoesMath!

Answer:

I think your formula  (2y/x2) is equivalent to

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