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Mathematical problems of mathematical square difference formula
1, ∫ x 2-y 2 = (x+y) (x-y) = 24, while x+y=4, ∴x-y=6, so (x-y) 2 = 6 2 = 36.

2、9x^2- 16=9(x^2+x-6)

9x^2- 16=9x^2+9x-54

9x=54- 16

9x=38

x=38/9

3. The original formula = x2-4Y2-(y2-4x2) = x2-4Y2-y2+4x2 = 5x2-5Y2 = 5 (x2-y2) = 5 (x+).