Factories
x⁴-19x²y²+25y⁴
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Step-by-step explanation:
x^4 - 10x^2y^2 -9x^2y^2 +25y^4
=x^4-2×x^2×y^2×5 +(5y^2)^2 -(3xy)^2
=(x^2-5y^2)^2-(3xy)^2
=(x^2-5y^2-3xy)(x^2-5y^2+3xy)
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