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(a). (10mn + 15 mn) - (3mn + 5) =
10mn + 15mn - 3mn - 5 =
22mn - 5
(b). (40xy - 45x) - (40xy - 45x) = 0
2).
(a). m(3n + 5) = 3mn + 5m
3).
(a). (3a²b^4c²)³ = 27a^6b^12c^6
(b). (4x²y)² = 16x^4y²
4).
(a). (x + 8)² = (x + 8)(x + 8) =
x² + 8x + 8x + 64 = x² + 16x + 64
(b). (2a + 3)² = (2a + 3)(2a + 3) =
4a² + 6a + 6a + 9 = 4a² + 12a + 9