Question

(-3x)^4 in expanded from

Answer 1

How to get answer:
`\mathrm{Apply\:exponent\:rule}:\quad \left(-a\right)^n=a^n,\:\mathrm{if\:}n\mathrm{\:is\:even}`

`(-3x)^(4) = (3x)^4\\(3x)^4\\\mathrm{Apply\:exponent\:rule}:\quad \left(a\cdot \:b\right)^n=a^nb^n\\=3^4x^4\\3^4=81\\=81x^4`