Factorise (x+4)^2-5xy -20 y -by^2
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x square+16+8x-5xy-20y-by square
x square+(-by) square-5xy+8x+16
x square+(-√b.y) ka square-5xy+8(x+2)
x square+(-by) square-5xy+8x+16
x square+(-√b.y) ka square-5xy+8(x+2)
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