Select a suitable identity and find the following products (2b-a) (2b+c)
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by using the identity(x+y)(x+z)=x²+(y+z)x+yz
substitute x by 2b, y by -a ,z by c
(2b-a)(2b+c)=4b²+(-a+c)2b-ac
substitute x by 2b, y by -a ,z by c
(2b-a)(2b+c)=4b²+(-a+c)2b-ac
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