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Kisachek [45]
3 years ago
15

PLZZZ HELP ASAP 50 POINTS!!!!

Mathematics
2 answers:
Ilya [14]3 years ago
6 0
1- the answer is b and d 2- the answer is a and b 3- the answer is b

ser-zykov [4K]3 years ago
4 0
<span>1= a. (0, -125)

2=</span><span>c. (-2, 1/16) 

3=</span><span>b. (0,3) 

hope this is right sorry if its not good luck!</span>
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PLEASE HELP!!This is joshs solution for the equation x^2-6x-7=0: x^2-6x-7=0
iren [92.7K]

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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