A. 2x3 − 11x2 − 11x + 10
B. 2x3 − x2 − 9x + 10
C. 2x3 − x2 − 11x + 10
D. 2x3 + 11x2 − 11x + 10
here are the answers. i don't understand. arent i supposed to multiply 2x + 5 and x2 − 3x + 2?
Let f(x) = 2x + 5 and g(x) = x2 − 3x + 2. Perform the function operation. g(x) · f(x). somehow i got the answer wrong?
2017-01-18 4:09 pm
回答 (4)
2017-01-18 4:17 pm
✔ 最佳答案
Well,(f . g)(x) = f(x) * g(x)
= (2x+5) * (x^2 - 3x + 2)
= 2x * (x^2 - 3x + 2) + 5 * (x^2 - 3x + 2)
= 2x^3 - 6x^2 + 4x + 5x^2 - 15x + 10
= 2x^3 - 6x^2 + 5x^2 + 4x - 15x + 10
= 2x^3 - x^2 - 11x + 10
therefore
C. 2x3 − x2 − 11x + 10
hope it' ll help !!
PS: if you want good answers, don't forget to give BAs too !! ;-)
2017-01-18 4:20 pm
f(x)•g(x)
= (2x + 5)(x² - 3x + 2)
= 2x(x² - 3x + 2) + 5(x² - 3x + 2)
= (2x³ - 6x² + 4x) + (5x² - 15x + 10)
= 2x³ - 6x² + 4x + 5x² - 15x + 10
= 2x³ + (-6x² + 5x²) + (4x - 15x) + 10
= 2x³ - x² - 11x + 10
The answer: C. 2x³ - x² - 11x + 10
= (2x + 5)(x² - 3x + 2)
= 2x(x² - 3x + 2) + 5(x² - 3x + 2)
= (2x³ - 6x² + 4x) + (5x² - 15x + 10)
= 2x³ - 6x² + 4x + 5x² - 15x + 10
= 2x³ + (-6x² + 5x²) + (4x - 15x) + 10
= 2x³ - x² - 11x + 10
The answer: C. 2x³ - x² - 11x + 10
2017-01-18 4:22 pm
Yes multiply them
2x^3 - x^2 - 11x + 10
Answer C
2x^3 - x^2 - 11x + 10
Answer C
2017-01-18 7:15 pm
[ 2x + 5 ] [ x² - 3x + 2 ]
2 x³ - 6x² + 4x
____ 5x² - 15x + 10
2x³ - x² - 11x + 10_______Opotion C
2 x³ - 6x² + 4x
____ 5x² - 15x + 10
2x³ - x² - 11x + 10_______Opotion C
收錄日期: 2021-04-18 15:58:02
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