3 years ago

Solve by completely the square x^2-8x-20=0

Mathematics

2 answers:

tigry1 [53]3 years ago

8 0

Answer:

x = -2, 10.

Step-by-step explanation:

x^2-8x-20=0

(x - 4)^2 - 16 - 20 = 0

(x - 4)^2 = 36

x - 4 =+/-sqrt36

x = 4+6 , 4 - 6

x = -2,10

Marysya12 [62]3 years ago

7 0

Answer:

x=5

Step-by-step explanation:

x^2 is 1

You might be interested in

Round to the nearest hundredth if so. Use 3.14 as pi <br>8. r=<br> d =<br> C=78.8 ft

Kryger [21]

Answer: The radius is 12.54 feet, and the diameter is 25.08 feet.

Explanation: By applying the circumference into the equation r = $\frac{C}{2\pi }$ , we get r = $\frac{78.8}{2\pi }$ which simplifies the radius. And since radius is half of diameter, we multiply by 2 to get the diameter as well to solve the other blank in the problem.

Hope this helps! :D

7 0

3 years ago

Find the equation of a line that passes through the point (4,2) that is perpendicular to the line y=4/3 x

Mrac [35]

Answer:

$y=\frac{3}{4}x-1$

Step-by-step explanation:

Since we're looking at perpendicular lines, the slope of the new line is the reciprocal of the original line.

So the slope of our new line is $\frac{3}{4}$

So far, we are looking at $y=\frac{3}{4} x+b$

Now we need to find the b value by plugging in the given point.

$2=\frac{3}{4}(4)+b\\ 2=3+b\\ b=-1$

So the final equation is $y=\frac{3}{4}x-1$

8 0

4 years ago

A square has a side length of 4 cm. What is the length of the diagonal of the square? What is the length from the corner to the

masya89 [10]

The length of the diagonal of the square is the square root of 32 which equals approximately 5.6569.
The length from the corner to the center of the square is half of the diagonal which is 2.8284. I hope this helps!

7 0

4 years ago

Carl wants to find the product 30×56.

ozzi

Answer:

Your answer will be D. He knows that 30 × 16 is 5 then multiples 5 by 5 to get 25.

4 0

3 years ago

Help please...I'll do anything...

Sveta_85 [38]

Answer:

Step-by-step explanation:

Here is a formula that can help:

4 0

3 years ago