noxali
noxali
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a) (a²+1)²= a^4+2a²+1 b) (5a²-1)²=25a^4-10a²+1 c) (1+7x²).(1-7x²)=1²-(7x²)²=1-49x^4
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a) (a²+1)²= a^4+2a²+1 b) (5a²-1)²=25a^4-10a²+1 c) (1+7x²).(1-7x²)=1²-(7x²)²=1-49x^4
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a) (a²+1)²= a^4+2a²+1 b) (5a²-1)²=25a^4-10a²+1 c) (1+7x²).(1-7x²)=1²-(7x²)²=1-49x^4