Question

Jenny

請問紅色圈起來的地方是為什麼？
謝謝🙏

7−(−2+h)— √7−(−2)
h
−1
−1
√9-h+3 V9+3
My
Ax
As h→0.
=
9-h-3
h
6
=
9-h-3√9-h+3 (9-h)-9
-1
=
√9+h+3h(√√9+h+3)¯¯ √√9+h+3²
Th
⇒ at P(-2,3) the slope is
=