calculus
posted by jenny .
The linear approximation at x=0 to f(x)= sqrt (7+6x) is y=

for f(x)=sqrt(7+6x)
Calculate the slope at x0=0, i.e.
m=f'(x0)=f'(0)
and the value of y0=f(x0) to give the tangent point (x0, f(x0))=(0,f(0))
The linear approximation at x=0 is given by
y = m(xx0)+y0
If you have difficulties finding the derivative of f(x), post for more information.