simplify (x+2)+(x-2)(2x+1)?
回答 (11)
2009-03-23 10:08 am
✔ 最佳答案
(x+2)+(x-2)(2x+1)(x+2)+(2x^2+x-4x-2)
x + 2 + 2x^2 + x - 4x - 2
2x^2-2x
2x(x-1)
2009-03-23 7:21 pm
(x + 2) + (x - 2)(2x + 1)
= x + 2 + x*2x - 2*2x + x*1 - 2*1
= x + 2 + 2x^2 - 4x + x - 2
= 2x^2 - 3x + x + 2 - 2
= 2x^2 - 2x
= 2x(x - 1)
= x + 2 + x*2x - 2*2x + x*1 - 2*1
= x + 2 + 2x^2 - 4x + x - 2
= 2x^2 - 3x + x + 2 - 2
= 2x^2 - 2x
= 2x(x - 1)
2009-03-23 5:10 pm
x + 2 + 2x ² + x - 4x - 2
2x ² - 2x
2x ² - 2x
2009-03-23 5:07 pm
(x+2)+(x-2)(2x+1):
(x + 2) + (2x^2 + x - 4x^2 - 2)
= x + 2 - 2x^2 + x - 2
= -2x^2 + 2x
:)
(x + 2) + (2x^2 + x - 4x^2 - 2)
= x + 2 - 2x^2 + x - 2
= -2x^2 + 2x
:)
2009-03-23 5:06 pm
x+2+2x^2+x-4x-2=
=2x^2-2x=2x(x-1)
=2x^2-2x=2x(x-1)
2009-03-23 5:05 pm
Expand last two brackets giving you 2x^2-3x^2-2x then collect like terms with the other bracket giving you 2x^2-2x
2009-03-23 5:05 pm
x+2+x-2^2x+1
=x+x=2x
=2x^2x+1
=4x+1
^=multiply
=x+x=2x
=2x^2x+1
=4x+1
^=multiply
2009-03-23 5:03 pm
(x+2)+(x-2)(2x+1)
(x+2)+(2x^2 + x - 4x - 2)
(x+2)+(2x^2 - 3x - 2)
2x^2 - 2x
2x(x-1)
l.d. got it wrong as he/she multiplied 2x by -2x at one stage.
(x+2)+(2x^2 + x - 4x - 2)
(x+2)+(2x^2 - 3x - 2)
2x^2 - 2x
2x(x-1)
l.d. got it wrong as he/she multiplied 2x by -2x at one stage.
2009-03-23 5:00 pm
simplyfy by expanding the last 2 brackets together
x+2+2x^2+x-4x-2
then simplyfy again
-2x+2x^2-2
x+2+2x^2+x-4x-2
then simplyfy again
-2x+2x^2-2
2009-03-23 4:59 pm
(x + 2) + (2x^2 + x - 4x^2 - 2)
= x + 2 - 2x^2 + x - 2
= -2x^2 + 2x
= x + 2 - 2x^2 + x - 2
= -2x^2 + 2x
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