(5t4 + 6t3 – 3t2 + 4t - 11) - (-9t4 – 6t3 + 5t2 + 3t + 8)

Can somone help me ?
Simplify . . .

2 answers

Online "^" is used to indicate and exponent, e.g., x^2 = x squared.

A minus times a minus = a plus.

5t^4 + 6t^3 - 3t^2 + 4t - 11 + 9t^4 + 6t^3 - 5t^2 -3t - 8

Combine like terms.
i don't know how to . . .