Question

Let f(x)=1/√x+7 .Show how to use the definition of derivative to find f'(2).​

Answer 1

$f \sqrt{x} = 1 \ \sqrt{x} + 7 \\ \\ f \sqrt{2} = 1 \div \sqrt{2} + 7 \\ = (1 + 7 \sqrt{2} ) \div \sqrt{2}$