how do I simplify 5x^4(x^2)?

The only time you multiply exponents is if one is an exponent of the other.
i.e. (x^4)^2 = x^8. In this case you just add them.

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5x^4(x^2)
= 5x^(4 + 2)
= 5x^6

5X^ 4( X^2)
= 5X^(4+2)
= 5 X^6 the answer

5x^4 (x^2)
5x^6

5 (x^4) (x^2) = 5 x^6

FORMULA IS
x^a*x^b= x^a*(x^b)=x^(a+b)
add the power
bracket can be removed and quantity will be remain same
now 5x^4(x^2)
=5x^4*x^2
=5x^(4+2)
=5x^6 ans

5*x^4(x^2)=
5*x^(4+2)=
5*x^6

note
multiplication of same base is the addition of exponents
5x^4 (x^2) = 5x^(4 + 2) = 5x^6

When multiplying exponents, add the exponents:

5x^4(x^2) = 5x^6