When f(x) is divided by x + 4 the quotient is x2+5x−3+2x+4. What is f(−4)?

F(x) = (x2+5x-3+2x+4)(x+4)
=> f(-4)=((-4)2+5(-4)-3+2*(-4)+4)(-4+4)=0
F(-4)=0

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.