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Matematika SMA Kelas 11TURUNAN
No. 3
f(x) = (2x+1) (x-5)
= 2x² - 10x + x - 5
= 2x² - 9x - 5
f'(x) = 4x - 9
No. 4
f(x) : (3x-2) / (5x+6)
Mis : u = 3x-2 maka u' = 3
v = 5x+6 maka v' = 5
f'(x) = (u'v-uv') / v²
= {3(5x+6) (3x-2)5} / (5x+6)²
= {3(5x+6) (3x-2)5} / (5x+6)(5x+6)
= {15(3x-2)} / (5x+6)
= (45x-30) / (5x+6) _____________________