bantu jawab yaaaaaaaaaaa 2 soal pakai jalan

21. limit

lim(x->√2) {x²- 2} / (x- √2) =
= lim(x->√2)  (x+ √2)(x-√2) / (x - √2)
= lim(x->√2) ( x+ √2)
= √2  + √2
= 2√2

22. turunan

f(x)= (2x² + 3)/(x-6)
f(0)= (0 + 3) /(0 - 6)
f(0) = 3/-6
f(0)= - 1/2
.
f(x)= (2x² + 3)/(x-6)
f(x)= u/v
f'(x)= (u'v - uv')/v²
f '(x)= {(4x)(x-6) - (2x²+3)(1) }/(x-6)²
f '(x)= (4x² - 24 x - 2x² - 3) / (x - 6)²
f '(x) = (2x² - 24x - 3)/(x - 6)²
f'(0)=  (-3)/(-6)² = -3/36
f '(0)= - 1/12

f(0) + f '(0)= 1/2  - 1/12 = 5/12