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Marina86 [1]
3 years ago
5

Solve x^2-8x+5=0 using the completing-the-square method

Mathematics
1 answer:
eduard3 years ago
4 0

Answer:

x = 4 ± \sqrt{11}

Step-by-step explanation:

To complete the square

add (half the coefficient of the x- term)² to both sides

x² + 2(- 4)x + 16 + 5 = 16

(x - 4)² + 5 = 16 ( subtract 5 from both sides )

(x - 4)² = 11 ( take the square root of both sides )

x - 4 = ± \sqrt{11} ( add 4 to both sides )

x = 4 ± \sqrt{11} ← exact values

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Elena L [17]
This is a same side interior angle, which means that the two angles, when added, will equal 180°

y + 72 = 180

Isolate the y, subtract 72 from both sides

y + 72 (-72) = 180 (-72)

y = 180 - 72

y = 108

A) 108°, is your answer


hope this helps
3 0
3 years ago
Read 2 more answers
Solve the equation for x. show each step of the solution. name the justifications for each step of the solutions.
sweet [91]
9/2{8-x}+36=102-5/2{3x+24}
you first use 9/2 to open brackets
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5 0
3 years ago
The measure of ∠BCD is 120°. The measure of ∠ABC is 85°.
saveliy_v [14]

Answer:

Step-by-step explanation:

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And if, you could only let it be, you will see

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4 0
3 years ago
A square room has a tiled floor with 81 square tiles. How many tiles are along an edge of the room?
Sladkaya [172]

Answer:

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Step-by-step explanation:

Because the room is square, the numbers of tiles along the edge of the room were multiplied by the same number, meaning that:

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So the length of one side is 9 tiles. Now to calculate the circumference, as each side of a square is the same length, we can multiply this number by 4:

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So there are 36 tiles along the edge of the room.

Hope this helps!

4 0
3 years ago
Evaluate<br> 5^3 (64/8) + 10^2<br> Enter your answer in the box
12345 [234]

Answer: 1100

Step-by-step explanation: All u had to do was simplfiy the fraction. Hope this helps ! good luck , <3

6 0
3 years ago
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