A. evaluate the following algebraic expression using A= 2 B=3 C=-4

1. 5a + ^3b = 5(2) + 3(3) = 10 + 9 = 19
2. 2c^2 - 1
3. 9^2+ 3b + c
4. (2×^2+4) + (×^2-×)
5. (×^2+×-2) + (5×^2+×+8)
6. (8×^2 +×+2) - (-2×^2+5×-4)
(No. 2 and 3 EVALUATE / No. 4,5 and 6 Add and Subtract polynomials​