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Question 3 - B

Question 5 - A

Step-by-step explanation:

Question 3

-2(x+6)(x-1)  - answer B

Expand the brackets

(x+6)(x-1) = x² - x + 6x - 6

Simplify = x² + 5x - 6

Now multiply this by -2

-2(x² + 5x - 6) = -2x² + 10x + 12

Question 5

5(x² + 8)(x² - 8) - answer A

First expand brackets.

(x² + 8)(x² - 8) = x⁴ - 8x² + 8x² - 64

8x² cancels out to x⁴ - 64

Now multiply this by 5

5(x⁴ - 64) = 5x⁴ - 320

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