Question

I need help on 4b & 4d

Answer 1

Answer:

4b is simplified. There are no like terms to combine.

${b}^{2}$

is the only term with exponent of 2.

13b is the only term b, exponent of 1.

13 is the only number.

Step-by-step explanation:

For 4d, it is hard to see but I think it is

$7a + 4 - 6 {a}^{2} - 2a$

Reorder terms from largest to smallest exponent.

$- 6 {a}^{2} + 7a - 2a + 4$

$- 6 {a}^{2} + (7 - 2)a + 4$

$- 6 {a}^{2} + 5a + 4$