Question

(b) a² + 2ab - b2; 4a2 - 2ab + 4b2​

Answer 1

Answer:

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Step-by-step explanation:

Step-by-step explanation: let be added X, then ,a²+b²+2ab +X =4ab +b²,now 4ab –a²–b²–2ab +b²=X, X=2ab–a² so we added a(2b–a) in it