Question

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Answer 1

Remember that an exponent means repeated multiplication.

The exponent of 4 means you have four
`\big(b^2\big)`'s mutiplied together:

`\big(b^2\big)\cdot\big(b^2\big)\cdot\big(b^2\big)\cdot\big(b^2\big)`

And then each exponent of 2 inside means you have two
`b`'s multiplied inside each set of parentheses.:

`\big(b\cdot b\big)\cdot\big(b\cdot b\big)\cdot\big(b\cdot b\big)\cdot\big(b\cdot b\big)`

There are 8 b's there when you expand this out.