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qwelly [4]
3 years ago
11

Which of the following is the result of the equation below after completing the square and factoring? x^2-4x+2=10

Mathematics
1 answer:
Tamiku [17]3 years ago
6 0

9514 1404 393

Answer:

  B. (x-2)^2=12

Step-by-step explanation:

The constant that completes the square is the square of half the coefficient of the x-term. That value is (-4/2)^2 = 4.

There is already a constant of 2 on the left side of the equal sign, so we need to add 2 to both sides to bring that constant value up to 4.

  x^2 -4x +2 = 10 . . . . . . . given

  x^2 -4x +2 +2 = 10 +2 . . . . complete the square (add 2 to both sides)

  (x -2)^2 = 12 . . . . . . . . . write as a square

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Is 90° an acute angle, right angle, obtuse<br> angle, or straight angle?
VashaNatasha [74]

Answer:

90 degrees is a right angle.

Step-by-step explanation:

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Imagine this is a graph, that little square of the right would represent 90 degrees.

Angles less than 90 are acute angles, angles over 90 but under 180 degrees would be obtuse, and angles that are equal to 180 degrees are straight.

6 0
2 years ago
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$456 is divided between the telephone and electricity bills in a ratio of 2 : 1. What amount goes to the telephone bill?
kipiarov [429]
$304 is the answer because 456/3 and then multiply by 2
5 0
2 years ago
I really need help! This is last minute and its 1 am. I'm tired so I'm going to leave it to you guys to solve my problems and pr
Illusion [34]

Answer:

<h2><u>question 1</u></h2>

n^{2} - 20n -96 = 0

use product and sum method

product = -96

sum = -20

numbers needed = ( -24 , 4)

n - 24 = 0

n + 4 = 0

hence <u>n = 24 and n = -4 </u>

<u></u>

<h2><u>Question 2 </u></h2>

<u />x^{2} + 12 x = 48<u />

in the form ax^{2}  +bx +c = 0

= x^{2} +12x - 48

make use of the formula :

\frac{-b+-\sqrt{b^{2} -4ac} }{2a}

replace values to make 2 equations :

1.\frac{-12+\sqrt{12^{2} -4*1*-48} }{2*1} = 3.17

2.\frac{-12-\sqrt{12^{2} -4*1*-48} }{2*1} = -15.2

hence <u>x = 3.17 and x = -15.2</u>

<u />

<h2><u>Question 3 </u></h2>

<u />x^{2} -14x+40=0<u />

use product and sum method

product = 40

sum = -14

numbers needed = (-10 , -4)

x - 10 = 0

x - 4 = 0

hence<u> x = 10 and x = 4</u>

<u />

<h2><u>Question 4 </u></h2>

<u />5b^{2} -20b-18 = 7<u />

in the form ax^{2}  +bx +c = 0

this becomes 5b^{2} -20b-18-7

= 5b^{2} -20b-25

can simplify by 5

= b^{2} -4b-5 =0\\

use product and sum method

product = -5

sum = -4

numbers needed (-5 , 1)

b-5 = 0

b + 1 = 0

hence <u>b = 5 and b = -1</u>

5 0
3 years ago
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Find the slope of a line perpendicular to y = 3x + 7
Vikki [24]

Answer:

-1/3

Step-by-step explanation:

The slope of the line has the form y = mx + b where m is the slope. Here the slope is m = 3. A line perpendicular to it will have a negative reciprocal slope. The negative reciprocal of 3 is -1/3.

4 0
3 years ago
N^2 + 36n + c "find the value of c that completes the square"
RSB [31]

For this case we have the following polynomial:

n ^ 2 + 36n + c

To find the value of c that completes the square, we use the following equation:

c = (\frac {b} {2}) ^ 2

Where,

  • <em>b: coefficient of the variable of degree 1 </em>

Substituting values we have:

c = (\frac {36} {2}) ^ 2\\c = (18) ^ 2\\c = 324

Answer:

the value of c that completes the square is:

c = 324

8 0
3 years ago
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