Find all numbers that must be excluded from the domain of each rational expression. 7/(x−3)

Perform the indicated operation.

$\(\left\)(x^3+3x^2-7x\(\right\))+2\(\left\)(x^3-5x^2+9x+4\(\right\))$

Perform the indicated operation.

$\(\left\)(-2x^4+10x^3+6x-3\(\right\))-\(\left\)(x^4-7x^2+8x+5\(\right\))$

Evaluate each algebraic expression for the given value or value(s) of the variable(s). 3+6(x-2)³ for x = 4

In Exercises 1–6, find all numbers that must be excluded from the domain of each rational expression. (x+5)/(x²−25)

In Exercises 5–8, find the degree of the polynomial. 3x²−5x+4