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3 years ago

Solve.

Mathematics

1 answer:

adoni [48]3 years ago

5 0

6+(-2)+2•(-8)•42=6-2+(-16)•42=4+(-672)=4-672=-668

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If the length of the legs of a right triangle are 5 m and 7 m, what is the length of the hypotenuse?

irakobra [83]

Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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2 years ago

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Nookie1986 [14]

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3 years ago

Read 2 more answers

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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2 years ago