Multiplying Monomials?

Question

How do you [n5(n2)] thats the exponent 5 and 2, and b(b4) 4 is the exponent,(-7x2)(x4) two and four are the exponents
plz help me

Answer 1

when multiplying bases with different exponents you add the exponents together.

For example (n^5)(n^2) = n^(5+2) = n^7