(y-4/5)(y+4/5)?

Answer 1

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It's a difference of two squares:

(A + B)(A - B) = A^2 - B^2

Therefore, (y-4/5)(y+4/5) = y^2 - 16/25

Answer 2

Use the FOIL method to solve this First number times first number or Y times Y which is Y squared. Outer number times outer number. inner number times inner number. last number time last number. then combine like terms.