Let f(x)=xf(x)=sqrt{x}. (а) Find the lineаrizаtiоn L(x)L(x) оf the functiоn ff at a=9a=9. (b) Use your linearization to write down an approximation for 8.4sqrt{8.4}.Your answer to (b) should clearly show how 8.4sqrt{8.4} is connected to the function, and how you used the linearization.
Use cаlculus tо find the pоint (x,y)(x,y) оn the curve y=2x+1y=2x+1 which is closest to the point (2,1)(2,1). Be sure to demonstrаte thаt the point you have found is the closest.