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2 years ago

What is the factored form of x2 − 4x − 5?

Mathematics

2 answers:

LekaFEV [45]2 years ago

6 0

Factors of -5 are -5 and 1 or 5 and -1

-5 + 1 = -4 so D is the correct answer.

Oksi-84 [34.3K]2 years ago

5 0

Answer:

(x - 5)(x + 1)

Step-by-step explanation:

To solve this, using knowledge of quadratic equations, the two numeral elements (the x intercepts) of the factors, would be a form of 1 and 5, as when they are multiplied by one another they will produce a 5 and when 1 is subtracted from 5 it gives a difference of 4. To get - 4, the 5 has to be negative. The results can be tested by multiplying out the two brackets.

$(x-5)(x+1)\\=x^{2}-5x+1x-5\\=x^{2} -4x-5$

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To be honest with u I think that u need to multiply 10 times 48.. I think thats it not sure if is the 100% correct answer

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3 years ago

Simplify 2x + 1 - x +2.

Pavlova-9 [17]

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Step-by-step explanation:

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2 years ago

Use the difference of squares identity to write this polynomial expression in factored form: 9x2 − 49.

qwelly [4]

9x^2-49
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3 years ago

Read 2 more answers

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iren2701 [21]

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1 year ago

Let V be the volume of the solid obtained by rotating about the y-axis the region bounded y = 4x and y = x2/4 . Find V by slicin

aliya0001 [1]

Answer:

Step-by-step explanation:

Consider the graphs of the $y = 4x$ and $y = \frac{x^{2} }{4}$ .

By equating the expressions, the intersection points of the graphs can be found and in this way delimit the area that will rotate around the Y axis.

$4x = \frac{x^{2} }{4} \\ x^{2} = 16x \\ x^{2} - 16x = 0 \\ x(x-16) = 0$ then $x=0$ o $x=16$ . Therefore the integration limits are:

$y = 4(0) = 0$ and $y = 4(16) = 64$

The inverse functions are given by:

$x = 2 \sqrt{y}$ and $x = \frac{y}{4}$ . Then

The volume of the solid of revolution is given by:

$\int\limits^{64}_ {0} \, [2\sqrt{y} - \frac{y}{4}]^{2} dy = \int\limits^{64}_ {0} \, [4y - y^{3/2} + \frac{y^{2}}{16} ]\ dy = [2y^{2} - \frac{2}{5}y^{5/2} + \frac{y^{3}}{48} ]\limits^{64}_ {0} = 546.133 u^{2}$

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3 years ago