the first step to solving this is to multiply each term in the parenthesis by -7k
-7k x 8k² - 7k x 9k - 7k x 6
now you need to calculate the first product
-56k³ - 7k x 9k - 7k x 6
and now calculate the product after that
-56k³ - 63k² - 7k x 6
finally,, calculate the last product in the equation
-56k³ - 63k² - 42k
you can no longer calculate any further,, making your answer: -56k³ - 63k² - 42k
let me know if you have any further questions
:)
