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mel-nik [20]
3 years ago
11

How do i solve x squared = 4x -5

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
6 0

Answer:

x = 2 ±i

Step-by-step explanation:

x^2 = 4x-5

Subtract 4x from each side

x^2 - 4x = 4x-5 -4x

x^2 - 4x= -5

Complete the square

Take the coefficient of the x term, divide by 2 and square it

-4/2 =2   2^2 =4

Add 4 to each side

x^2 -4x+4 = -5 +4

The left side is (x-coefficient of the x term/2)^2

(x-2)^2 = -1

Take the square root of each side

sqrt((x-2)^2) = sqrt(-1)

x-2 = ±i

Add 2 to each side

x-2+2 = 2 ±i

x = 2 ±i

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Oksi-84 [34.3K]

Answer:

<h2>2 x 2</h2>

Step-by-step explanation:

Dimensions: m x n

m = number of rows

n = number of columns

When multiplying two matrices:

m x n *  n x k = m x k

MATIX 1:

m = number of rows

n = number of columns

MATRIX 2:

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RESULTING MATIX:

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8 0
3 years ago
Read 2 more answers
ANSWER FAST GET 100 POINTS AND BRAINLIEST
klio [65]

The student with the most accurate description of the graph that represents Kate's movement is Tim

<h3>The student with the accurate description</h3>

From the graph that represents Kate's distance per minute, we have the following highlights:

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  • Then she drives at a regular speed for 4 minutes
  • Then she stopped moving for the next 2 minutes

The student's description that matches the above highlights is Tim

Hence, the student with the most accurate description is Tim

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2 years ago
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What is the answer for 9-0-5-(-20)+(-13)?
Nitella [24]

The correct answer is: 11

Here’s how you solve it!

You can remove the 0 since when you add or subtract 0 it stays the same.

Then you would want to look at the first set of parentheses (-20)

Since it is -(-20) this changes the sign to a positive +20

9-5+20+(-13)

Now since the + is in front of the (-13) it remains the same.

Now you are left with this:

9-5+20-13

9-5=4

4+20=24

24-13=11

Then you are left with your answer: 11

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3 years ago
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kolbaska11 [484]

Hey There!! ~

The answer to this is: the upper bound for the length is 21.5cm. Lower and Upper Bounds

The lower bound is the smallest value that will round up to the approximate value.

The upper bound is the smallest value that will round up to the next approximate value.

Ex:- a mass of 70 kg, rounded to the nearest 10 kg, The upper bound is 75 kg, because 75 kg is the smallest mass that would round up to 80kg.

Here , A length is measured as 21cm correct to 2 significant figures. We need to find what is the upper bound for the length . let's find out:

As discussed above , upper bound for any number will be the smallest value in decimals which will round up to next integer value . So , for 21 :

⇒  21.5cm.

21.5 cm on rounding off will give 22 cm . So , the upper bound for the length is 21.5cm.

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Answer:

18

Step-by-step explanation:

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