Macymartin99651 Macymartin99651 27-02-2024 Mathematics contestada Find the sum of the coefficients in the polynomial $3(3x⁷ + 8x⁴ - 7) + 7(x⁵ - 7x² + 5)$ when it is fully simplified. a) 27 b) 35 c) 49 d) 56