Question

Simplify 5b4×4b3 what is the answer for it ​

Answer 1

`{ \rm{ {5b}^(4) * {4b}^(3) }}`

• from laws of indices:

`\hookrightarrow \: { \boxed{ \rm{ {rx}^(n) + {px}^(m) = (r * p) {x}^((n + m)) }}} \\`

• substitute:

`{ \rm{ {5b}^(4) * {4b}^(3) = (5 * 4) {b}^((4 + 3)) }} \\ \\ = { \boxed{ \boxed{ \rm{ \: 20 {b}^(7) \: \: }}}}`