Factorise: X4/16-y4/81. please teach me how to do it and its x to the power4 upon 16 - y to the power 4 upon 81
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Answer:
x^4/16-y^4/81
=(x^2/4)^2-(y^2/9)^2
=(x^2/4+y^2/9)(x^2/4-y^2/9)
=(x^2/4+y^2/9){(x/2)^2-(y/3)^2}
=(x^2/4+y^2/9)(x/2+y/3)(x/2-y/3)
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