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just olya [345]
3 years ago
12

What is x*x-2x if x = -3

Mathematics
1 answer:
sveticcg [70]3 years ago
5 0

Put the value of x = -3 to the expression x · x - 2x:

<h3>(-3)(-3) - 2(-3) = 9 + 6 = 15</h3>
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The width of a rectangular field is 20 feet less than its length. The area of the field is 12,000 ft? What is the length of the
Scilla [17]

Answer:

The answer is 120 feet.

Step-by-step explanation:

The area of the field (A) is:

A = w · l       (w - width, l - length)

It is known:

A = 12,000 ft²

l = w - 20

So, let's replace this in the formula for the area of the field:

12,000 = w · (w - 20)

12,000 = w² - 20

⇒ w² - 20w - 12,000 = 0

This is quadratic equation. Based on the quadratic formula:

ax² + bx + c = 0      ⇒  

In the equation w² - 20w - 12,000 = 0, a = 1, b = -20, c = -12000

Thus:

So, width w can be either

or

Since, the width cannot be a negative number, the width of the field is 120 feet.

6 0
2 years ago
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What’s the correct answer for this?
Anton [14]

Answer:

A

Step-by-step explanation:

Plate X will result in the lightest place since it's density and thickness both are less.

6 0
2 years ago
Given that the image below is not drawn to
Natali [406]

Answer:

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Step-by-step explanation:

4 0
2 years ago
How many times does 27 go into 890
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a square is put together by two triangles. the hypotenuse is 11 cm and width if 8 cm. find the height of the triangle.
maksim [4K]

Answer:

b ≈ 7.54 cm

Step-by-step explanation:

Pythagorean Theorem

a² + b² = c²

a and b are the sides and c is the hypotenuse

hypotenuse is 11 cm

a side is 8 cm

so

8² + b² = 11²

64 + b² = 121

-64           -64

       b² =  57

    √b² =  √57

       b ≈ 7.54 cm ( use ≈ because its rounded so its not exact)

3 0
3 years ago
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