25x^2-70xy+49y^2-64z^2
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Step-by-step explanation:
25x²-70xy+49y²-64z²
(5*5*x²)-(7*5*2*xy)+(7*7y²)-(3*3*3*2*z²)
Answer:- 5*5*x²)-(7*5*2*xy)+(7*7y²)-(3*3*3*2*z²)
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