Factorise )64m^2-144 mn+81n^2)-25p^2
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(64m²-144mn+81n²)-25p²
={(8m)²-2.8m.9n+(9n)²}-(5p)²
=(8m-9n)²-(5p)²
=(8m-9n+5p)(8m-9n-5p)
={(8m)²-2.8m.9n+(9n)²}-(5p)²
=(8m-9n)²-(5p)²
=(8m-9n+5p)(8m-9n-5p)
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