-1 squared minus (- 1) squared =? A BASIC Math problem MANY will get WRONG!
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- Опубликовано: 28 фев 2024
- How to simplify a numeric expression with positive and negative numbers, subtraction and powers using the order of operations - PEMDAS.
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looking at this, this is about where the square applies, for the -1² it only applies to the 1, so that would be -1, but in the case of (-1)² it applies to the -1 which gives a positive 1, so this would be -1 - 1 = -2
Thank you for what you are doing. You are helping A lot of us adults at The Excel Center adult high school in Springdale, AR.
The odd thing is that if you used Excel and entered that same expression, the first minus has higher precedence than the exponentiation, thus the answer you would get is 0.
Thanks to previous videos and having made the mistake once I can now say that this problem was easy.
c. (-2)
I have one question. What do you think of the new math? I personally think it is very dumb I was needing to refresh my math skills and was using some online resources. I couldn't figure out what they were teach8ng.
when writing computer code and when I input this equation the computer WILL GET IT RIGHT! But was it what I, MYSELF, expected and/or desired ? There a difference between:
A teacher that teaches to think from the multiple answers forward, instead of solving the problem, is not a teacher.
when the negative symbol isn't in parentheses with the number you're squaring, that's the same as saying "Negative, x squared" , not "negative x, squared"
Which software you are using to teach ?
Very nice licture
My human computer came up with zero however, my little Sharp EL-501X agrees with you Mr.Math Man.
Didn't get me this time. This is why I use these refreshers.
super easy -1^2 is NOT (-1)^2 so there for we just square the first number and keep the negative sign. Now for the second part the () is used to show the negative 1 is being squared with the negative sign.
My default answer is 0, but that is assuming the -1 is negative one and not minus one...
Considering I haven't done this kind of math regularly since a couple of years prior to Panic at the Disco, I feel pretty good!
Ans. 0
Mr. Math teacher, I haven't seen this since 1999 when I was a senior in high school. But I guessed A because I thought negative 1 to 2nd power=1 so I got 1-1=0
Good
There are several things that break PEDMAS/BEDMAS - implied addition, the solidus and confusion regarding the binary operator minus (-) versus the unary operator denoting a negative number (-) (even more difficult when the exact same glyph is used.) The equation above is ambiguous because the leading '-' could be a minus (i.e. 0 - 1^2 - (-1)^2) or a unary negation -1^2 - (-1)^2. When there is no number before, a unary negation is implied, but it is not definitive. This is why many people will get zero. Also, there is NO governing body when relating to math equations, and while PEDMAS/BEDMAS has its religious followers, it is not definitive, and care should be taken to understand the meaning or reason behind the equation to avoid mistakes. A more complete standard would be the C operator precedence charts. GEMS (Groupings, Exponents, Multiplication or Division, Subtraction or Addition) is another competitor. TLDR; The author's intent is what defines the equation - this equation was written to be ambiguous. Keep up the good work! 😉