更新1:
Wonderful! Thanks, seeing that made me realize what my calc was doing, thanks so much!
Can you help me simplify the equation (10-2x)(8x-2x^2)?
2009-04-15 3:48 pm
I'm doing this for a calculus class, but evidently I need to go back to algebra because I can not figure this out. My calculator gave me the answer 4x(x-5)(x-4). The lowest I can simplify by hand is 2(x-5)(-x^2+4x) So either the calc is wrong or I'm just silly and I'm missing something. Thanks for any help!
回答 (5)
2009-04-15 3:57 pm
✔ 最佳答案
(10-2x)(8x-2x^2)=80x-20x^2-16x^2+4x^3
=4x^3-36x^2+80x answer//
2009-04-15 4:25 pm
(10 - 2x)(8x - 2x^2)
We can use the FOIL Method to multiply the above.
10 * 8x = 80x
10 * -2x^2 = -20x^2
-2x * 8x = -16x^2
-2x * -2x^2 = 4x^3
80x - 20x^2 - 16x^2 + 4x^3
Combine like terms:
-20x^2 - 16x^2 = -36x^2
80x - 36x^2 + 4x^3
or
4x^3 - 36x^2 + 80x
We can use the FOIL Method to multiply the above.
10 * 8x = 80x
10 * -2x^2 = -20x^2
-2x * 8x = -16x^2
-2x * -2x^2 = 4x^3
80x - 20x^2 - 16x^2 + 4x^3
Combine like terms:
-20x^2 - 16x^2 = -36x^2
80x - 36x^2 + 4x^3
or
4x^3 - 36x^2 + 80x
2009-04-15 4:08 pm
(10 - 2x)(8x - 2x^2)
= 10*8x - 2x*8x - 10*2x^2 + 2x*2x^2
= 80x - 16x^2 - 20x^2 + 4x^3
= 4x^3 - 36x^2 + 80x
= 10*8x - 2x*8x - 10*2x^2 + 2x*2x^2
= 80x - 16x^2 - 20x^2 + 4x^3
= 4x^3 - 36x^2 + 80x
2009-04-15 4:00 pm
The steps should look like this:
=(10-2x)(8x-2x^2)
=2(5-x)(2)(4x-x^2)
=4(5-x)(4x-x^2)
=4(5-x)(x)(4-x)
=4x(5-x)(4-x)
=4x(-1)(-1)(5-x)(4-x)
-1 x -1 = 1[remains the same]
=4x(-1)(5-x)(-1)(4-x)
=4x(x-5)(x-4)
hope that this may helps you!
=(10-2x)(8x-2x^2)
=2(5-x)(2)(4x-x^2)
=4(5-x)(4x-x^2)
=4(5-x)(x)(4-x)
=4x(5-x)(4-x)
=4x(-1)(-1)(5-x)(4-x)
-1 x -1 = 1[remains the same]
=4x(-1)(5-x)(-1)(4-x)
=4x(x-5)(x-4)
hope that this may helps you!
收錄日期: 2021-05-01 12:18:31
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