1) (4m-7)^2-64 = (4m-7-8)(4m-7+8) = (4m-15)(4m+1);
2) b^8-(b-4)^2 = b^8-4^2 = (b^4-4)(b^4+4) = (b^2-2)(b^2+2)(b^2+4);
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Answers & Comments
1) (4m-7)^2-64 = (4m-7-8)(4m-7+8) = (4m-15)(4m+1);
2) b^8-(b-4)^2 = b^8-4^2 = (b^4-4)(b^4+4) = (b^2-2)(b^2+2)(b^2+4);