Question

Multiplying monomials. please

Answer 1

28a^9

Explanation:

Answer 2

`{4a}^(4) * {7a}^(5) \\ \\ = (4 * 7)( {a}^(4) * {a}^(5) ) \\ \\ = 28( {a}^(4) * {a}^(5) )`

from law of indices:

`{n}^(x) * {n}^(y) = {n}^((x + y))`

therefore:

`= 28 \{ {a}^((4 + 5)) \} \\ \\ = 28 {a}^(9)`