(x²+y²)-16(x²-y²)分解因式

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(x²+y²)-16(x²-y²)分解因式

(x+y)²-16(x-y)²
=(x+y)²-16(x-y)(x+y)
=(x+y)[(x+y)-16(x-y)]
=(x+y)(17y-15x)

(x²+y²)-16(x²-y²)
=17x²-15y²
=(√17x+√15y)(√17x-√15y)