-2^2 = -4? Differentiability at a point: algabraically

Hoe kunnen we je helpen?

Fraser Stephens

8 oktober 2021 00:14

I got a question wrong in an exercise and when i opened the hint to check where i had gone wrong i noticed the first part of the equation was strange Where x=2 -×^2+3× =-2^2+3(2) The expression was answered as 2 and im guessing -2^2 was evaluated to -4.... is there something im missing? Im sure -2^2=4 and the answer should be 10 or am i wrong. The actual expression continues and this is just the first part of the equation to find f(×) and so it completely messed it up for me...unless im wrong? Am i wrong😲

Nieuwe post

2 opmerkingen

Officiële opmerking
Evan Lewis

10 oktober 2021 03:36
Acties voor opmerkingen Permalink
Hi Fraser,

A negative in front of an exponent base means that the exponent rule is applied first, and then the sign is changed. So, the expression -2^2 is really -(2)^2 or -(2^2) which is evaluated to -4.

To get +4 as the result, you would need to write the expression as (-2)^2 to indicate that the negative is also being squared, because by default the negative is not squared.

I hope this helps! Please let me know if you have any additional questions!
Fraser Stephens

10 oktober 2021 23:30
0

Acties voor opmerkingen Permalink
Thanks Evan,
Shortly after posting this i came to that conclusion.
Kind regards

Post is afgesloten voor opmerkingen.

-2^2 = -4? Differentiability at a point: algabraically

Niet gevonden wat u zocht?

2 opmerkingen

Niet gevonden wat u zocht?