I thought the answer was -3(negative 3); but I understand it's -2Y2(square). Can anyone explain why.
2007-07-29 11:04:35 · 5 answers · asked by ADM 3 in Science & Mathematics ➔ Mathematics
1y² - 3y² = (1 - 2) y² = - 1 y² = - y²
Note
1 - 3 = - 2 (from number line)
2007-07-29 11:09:30 · answer #1 · answered by Como 7 · 1⤊ 0⤋
The y^2's do not cancel...
Basically, this reads:
1 y^2 minus 3 y^2's equals what?
The y^2's are like... items... like, say, blocks. 1 block minus 3 blocks (in some crazy world) is negative 2 blocks, yes?
So, it's the same.
y^2 - 3y^2 = -2y^2
Since they are like terms, they act like... just.. blocks. =] That's kind of the best I can explain it.
I think you got confused because there is no number in front of the first y^2. There is a number there, it is 1, we just don't write it because 1 times anything is the same thing... so it's redundant. If it were 0, the y^2 wouldn't be there. Because 0 of anything is 0.
2007-07-29 18:14:31 · answer #2 · answered by its_victoria08 6 · 0⤊ 0⤋
Because u are taking 3y^2 from the only y^2 that u had...
its like u took three apples...when u only had enough money for one...so now u r negative (you owe) 2 apples
2007-07-29 18:08:42 · answer #3 · answered by natiassefa 2 · 1⤊ 0⤋
- 2 y^2
2007-07-29 18:09:05 · answer #4 · answered by CPUcate 6 · 0⤊ 1⤋
Are you kidding or you really don't know how to solve this? Of course it's -2y^2
It's like 1-3 which is -2
2007-07-29 18:15:01 · answer #5 · answered by Tasha 3 · 0⤊ 0⤋