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mikaylarichardson96
09.09.2019 •
Mathematics
Select the correct answer. what is the simplest form of this expression? (2x − 3)(3x2 + 2x − 1) a. 6x3 − 5x2 − 8x + 3 b. 6x3 − 5x2 − 6x + 2 c. 6x3 − 9x2 − 4x + 3 d. 6x3 − 2x2 − 8x + 3
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Ответ:
A. 6x3 − 5x2 − 8x + 3
Step-by-step explanation: this is a multiplication (2x − 3) = A (3x2 + 2x − 1) = B, so we are going to multiply each value from A with every value of B
for example you can start 2X from A
2X . 3X2 = 6X3
2X . 2X = 4X2
2X . -1 = -2X
now with -3
-3 . 3X2 = -9X2
-3 . 2X = -6X
-3 . 1 = -3
mow we can put every value in one equation
6X3 + 4X2 + 2X - 9X2 -6 X - 3
after that, you can simplify the common values for example
4X2 - 9X2 = -5x2
- 2X - 6 X = -8x
this the last equation that we get after simplify
6x3 − 5x2 − 8x + 3
Ответ:
4 and 28 on khan academy