Объяснение:
(4+5y)(5y-4)=(5y+4)(5y-4)=25y^2-16
(x-4)(x+4)=x^2-16
(7x-2)(7x+2)=49x^2-4
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Объяснение:
(4+5y)(5y-4)=(5y+4)(5y-4)=25y^2-16
(x-4)(x+4)=x^2-16
(7x-2)(7x+2)=49x^2-4
2)х^2-16
2) 49х^2-4