Recognize as difference of squares: Recognize the expression y2−9x6 as a difference of squares.A difference of squares is a binomial of the form a2−b2, which factors into (a+b)(a−b).Here, y2 is a perfect square (a2) and 9x6 is also a perfect square (b2) because 9 is a perfect square (32) and x6 is a perfect square a2−b20.
Write expression as difference of squares: Write the expression as a difference of squares. y2−9x6 can be written as (y)2−(3x3)2.
Apply difference of squares formula: Apply the difference of squares formula.Using the formula (a2−b2)=(a+b)(a−b), we get:(y)2−(3x3)2=(y+3x3)(y−3x3).
Check for additional factoring: Check for any additional factoring.The terms (y+3x3) and (y−3x3) are not factorable further with real numbers, so the expression is now completely factored.
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