I need help I got it wrong

Question

given: f(x)=x^2, and f(x+h)-F(x)/h and simplify

a.h

b.2x+1

c.2x+h

Answer 1

f( x + h) - f(x) ⁄ h = [ ( x + h ) ^ 2 - x ^ 2 ] / h

= ( x ² + 2 h x + h ² - x ² ) ⁄ h

= ( 2 h x + h² ) ⁄ h

= 2 x + h

Answer 2

Given f(x) = x^2. Therefore, f(x+h) = x^2+2xh+h^2.

f(x+h)+f(x) = x^2+2xh+h^2 - x^2 = 2xh+h^2

Therefore [f(x+h)+f(x)]/h = (2xh+h^2) / h = 2x+h.

Hope that makes sense.