what is 2x^2 + x^2 and 2x^2 * x^2?

👨🏻‍🏫 學術台數學

[匿名]

2010-02-21 2:15 pm

Basically what is:
2x squared add x squared?
2x squared times x squared?
And if you could explain it would be helpful. thanks :)

更新1:

also whats 2x^2 - x^2 and 2x^2 / x^2

回答 (5)

[匿名]

2010-02-21 2:25 pm

✔ 最佳答案

You can add terms like x together if they have the same power
2x^2 + x^2
They are both x^2 so you can add them
= 3x^2
The multiply terms together you need to multiply number and x's one at a time
2x^2 * x^2
x^2 is the same as 1x^2
So 2 * 1 =2
x^2 * x^2 = x^4 (To multiply powers together you add them)
So 2x^2 * x^2 = 2x^4
So if you had 2x^2 * 2x^2 = 4x^4

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An ESL Learner

2010-02-21 2:45 pm

1)
2x^2 + x^2
= (2 + 1)x^2
= 3x^2

2)
2x^2 * x^2
= 2 * x^2 * x^2
= 2 * x^(2 + 2)
= 2x^4

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[匿名]

2010-02-21 2:26 pm

if your still unsure check out http://www.bbc.co.uk/schools/gcsebitesize/maths/algebra/

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[匿名]

2010-02-21 2:25 pm

2x^2+x^2
=3x^2
(when bases and power are same and there is a + sign, then the coefficients are added)
and
2x^2*x^2
=2x^4
(when bases are same and they are multiplied then power are added)

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Iggy Rocko

2010-02-21 2:19 pm

2x^2 + x^2 = (2 + 1)x^2 = 3x^2
2x^2 * x^2 = 2x^(2 + 2) = 2x^4

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