please tell someone please explain to me a and b part please explain and I will mark you as a brainlist promise
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a) difference
b) (a-b)² identity will be used
16p⁴-56p²q²+49q²
=(4p)²-2(4p)(7q)+(7q)²
=(4p-7q)²
=(4p-7q)(4p-7q)
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