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B. (5a-7)(5a-7) = 25a^2 - 35a - 35a + 49 = 25a^2 - 70a + 49
C. (7a^2 + 4a)(7a^2 +4a) = 49a^4 + 28a^3 + 28a^3 + 16a^2 = 49a^4 + 56a^3 + 16 a^2
D. (4a^2-9a)(4a^2-9a) = 16a^4 - 36a^3 - 36a^3 + 81 a^2 = 16a^4 - 72a^3 + 81a^2
E. (x+4)(x+4)(x+4) = x^2 + 4x + x^2 + 4x + 4x + 16 + 4x + 16 = 2x^2 + 16x + 32