what is the difference when you subtract the sum of x squared minus 2x minus 8 and 7 x + 4 from 2x cube -6x+7
Answers
First Possible Question
What is the difference when you subtract the sum of x² - 2x - 8 and 7x + 4 from (2x)³ - 6x + 7
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Answer
⇒ (2x)³ - 6x + 7 - (x² - 2x - 8 + 7x + 4)
Combine Like Terms in bracket.
⇒ (2x)³ - 6x + 7 - (x² - 2x - 8 + 7x + 4)
⇒ (2x)³ - 6x + 7 - (x² - 2x + 7x - 8 + 4)
Add the numbers in the bracket.
⇒ (2x)³ - 6x + 7 - (x² + 5x - 8 + 4)
⇒ (2x)³ - 6x + 7 - (x² + 5x - 4)
Substitute the negative and positive sign and remove the numbers outside the bracket.
⇒ (2x)³ - 6x + 7 - x² - 5x + 4
Combine Like Terms
⇒ 8x³ - 6x - 5x + 7 + 4 - x²
⇒ 8x³ - 11x + 11 - x²
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Second Possible Question
What is the difference when you subtract the sum of x² - 2x - 8 and 7x + 4 from 2x³ - 6x + 7
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Answer
Combine Like Terms in bracket.
⇒ 2x³ - 6x + 7 - (x² - 2x - 8 + 7x + 4)
⇒ 2x³ - 6x + 7 - (x² - 2x + 7x - 8 + 4)
Add the numbers in the bracket.
⇒ 2x³ - 6x + 7 - (x² + 5x - 8 + 4)
⇒ 2x³ - 6x + 7 - (x² + 5x - 4)
Substitute the negative and positive sign and remove the numbers outside the bracket.
⇒ 2x³ - 6x + 7 - x² - 5x + 4
Combine Like Terms
⇒ 2x³ - 6x - 5x + 7 + 4 - x²
⇒ 2x³ - 11x + 11 - x²
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