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Originally Posted by graham1664 p^2-16(q-r)^2 First of all, that's an expression, NOT an equation.
Second, it's a Difference Of Two Squares.
p^2 - 16(q-r)^2 = (p – 4(q - r))(p + 4(q - r))
as x^2 = p^2 and a^2 = 16(q-r)^2
p^2 - 16(q-r)^2 = (p – 4q + 4r)(p + 4q - 4r)
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