exam Maths Puzzle Numerical Ability

Which of the following polynomials can be factored as a difference of two squares?

16x2 + 1
9y2 - 1
x2 + 4x + 4
144a2 + 16
all of the above

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exam Other Question
Ronald wants to sell his car through s broker who charges a commission of 10% of the selling price. Ronald still owes $11,025 on the car. Ronald must get enough money to at least pay off the loan. What is the range of the selling price? Im having problems understanding the distributive property....

its problems like this that i cant understand no matter what i do...

i keep getting them wrong.

4(6 + 8) + 2 (9 - 7)

thanks bunches

-Lizzy