Whats the best expansion for (x+5a+5b)(x+a-b)

If f(x)=2x^6+x^2+2 then what is the remainder when f(x)is divided by x+2

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

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