(5a²-3b²)+(a²+b²)-(5a²+3b²)
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(5a²-3b²)+(a²+b²)-(5a²+3b²)
(5a²-3b²)+(a²+b²)-(5a²+3b²)
(5a²-3b²)+(a²+b²)-(5a²+3b²)
(5a²-3b²)+(a²+b²)-(5a²+3b²)
=5a²-3b²+a²+b²-5a²-3b²
=(5a²+a²-5a²)+(-3b²+b²-3b²)
=a²-5b²
(5a²-3b²)+(a²+b²)-(5a²+3b²)
=(5+1-5)a²+(-3+1-3)b²
=a²-5b²