Hal makes an error when determining the difference quotient of f(x) = x2 + 11x + 2. His work is shown.

StartFraction ( (x + h) squared + 11 (x + h) + 2) minus (x squared + 11 x + 2) Over h EndFraction. StartFraction x squared + h squared + 11 x + 11 h + 2 minus x squared minus 11 x minus 2 Over h EndFraction. StartFraction h squared + 11 h Over h EndFraction. h + 11.

Which statement describes the error?

He did not expand (x + h)2 correctly.
He did not combine like terms correctly.
He should have subtracted f(x) – f(x + h), not
f(x + h) – f(x).
He should have added f(x + h) + f(x), not subtracted
f(x + h) – f(x).