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dlinn [17]
3 years ago
8

PLEASE HELP!!This is joshs solution for the equation x^2-6x-7=0: x^2-6x-7=0

Mathematics
1 answer:
iren [92.7K]3 years ago
4 0

Answer:

  no. see below

Step-by-step explanation:

This much of Josh's working is correct:

  x^2-6x=7

  x^2-6x+9=7+9

  (x-3)^2=16

At this point Josh apparently overlooked the fact that he needed to take the square root of both sides of the equation. Had he done that, he would have ...

  x -3 = ±4

  x = 3+4 . . . or . . . 3 -4

  x = 7 or -1

_____

Josh reported values of x that would match ...

  x -3 = ±16

He <em>violated the equal sign</em> by taking the square root on the left, and multiplying by ±1 on the right. Doing different operations on the two sides of the equation will mean the value of x is changed to something other than what you're looking for.

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9m-m+3=-2(m+1) <br> this thing wants 20 characters so..HI!
MrMuchimi

Answer:

m = -1/2

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

Step-by-step explanation:

<u>Step 1: Define</u>

9m - m + 3 = -2(m + 1)

<u>Step 2: Solve for </u><em><u>m</u></em>

  1. Combine like terms:                    8m + 3 = -2(m + 1)
  2. Distribute -2:                                8m + 3 = -2m - 2
  3. Add 2m on both sides:                10m + 3 = -2
  4. Isolate <em>m</em> term:                             10m = -5
  5. Isolate <em>m</em>:                                      m = -1/2
6 0
2 years ago
What type of transformation transforms (a, b) to ​(−a, b)​?
Vikentia [17]
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4 0
3 years ago
There are 27 girls and 36 boys who want to participate in a math competition. If each team must have the same ratio of girls and
Reptile [31]

Since the ratio of girls and boys must be the same in each team, and all the competitors must be involved, it means that each team's ratio of boys : girls must be equal to the total ratio of Boys : Girls = 36 :27= 4 / 3.

Now 4 / 3, the most simplified version of 36 / 27, happens by dividing the numerator & demoninator by 9 (the greatest number it can divide by). So the greatest number will be 9 teams, each of  4 Boys & 3 Girls

7 0
3 years ago
A circle has a circumference of 1133.54 units. What is the diameter of the circle?
vovangra [49]

Answer:

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Step-by-step explanation:

The formula for circumference of a circle is given by

C = pi *d

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