Bisa dibantu cara untuk nomor 4? terimakasih.

Bisa dibantu cara untuk nomor 4? terimakasih.

f(x) = 10 – 4x²

$limit_{h = > 0}( frac{f(x + h) - f(x)}{h} ) \ limt_{h = > 0}( frac{10 - 4 {(x + h)}^{2} - (10 - 4 {x}^{2} ) }{h} ) \ limit_{h = > 0}( frac{10 - 4( {x}^{2} + 2xh + {h}^{2} ) + 10 + 4 {x}^{2} }{h} ) \ limit_{h = > 0}( frac{ - 4 {x }^{2} - 8xh - 4 {h}^{2} + 4 {x}^{2} }{h} ) \ limit_{h = > 0}( frac{ - 8xh - 4 {h}^{2} }{h} ) \ limit_{h = > 0}frac{h( - 8x - 4h)}{h} \ limit_{h = > 0}( - 8x - 4h) \ = - 8x - 4(0) \ = - 8x$

jawaban : C