Question

4a + 7b + 3a - 2b + 2a; a= -5 and b=3

Answer 1

71

4a + 7b + 3a - 2b + 2a; a= -5 and b=3

4x5=20 7x3=21 3x5=15 2x3=6 2x5=10

20+21+15+6+10=?

20+21=41 15+6=21 -----> 21+10=31

31+41=71

Answer 2

-30

Explanation:

Evaluate 4 a + 7 b + 3 a - 2 b + 2 a where a = -5 and b = 3:

4 a + 7 b + 3 a - 2 b + 2 a = -5×4 + 7×3 - 5×3 - 2×3 - 5×2

4 (-5) = -20:

-20 + 7×3 - 5×3 - 2×3 - 5×2

7×3 = 21:

-20 + 21 - 5×3 - 2×3 - 5×2

3 (-5) = -15:

-20 + 21 + -15 - 2×3 - 5×2

-2×3 = -6:

-20 + 21 - 15 + -6 - 5×2

2 (-5) = -10:

-20 + 21 - 15 - 6 + -10

-20 + 21 - 15 - 6 - 10 = 21 - (20 + 15 + 6 + 10):

21 - (20 + 15 + 6 + 10)

| 1 |

| 2 | 0

| 1 | 5

| 1 | 0

+ | | 6

| 5 | 1:

21 - 51

21 - 51 = -(51 - 21):

-(51 - 21)

| 5 | 1

- | 2 | 1

| 3 | 0:

Answer: -30