Question

Bagaimana caranya ????

Answer 1

Verified answer

Jawab
y = 7x  + 4
m = 2

y = ax² - x + b
m = y' = 2a x - 1
untuk x = 1 --> m = 2a  - 1
2a - 1 = 7
a = 4

y = 4x² -x + b --> (1,c)
c= 4 - 1 + b
c= 3 + b

y= 7x +4 --> (1,c)
c = 7+ 4
c= 11

c= 3 + b
11 = 3 + b
b = 8

nilai a- b +  2c = 4 - 8 + 22  = 18