Question

Jika f (x)=ax+b,f(1)=5,dan f(2)=7maka nilai a kuadrat+b kuadrat adalah?

Answer 1

F(x) = ax + b = 5
f(1) = a(1) + b = 5
= a + b = 5
= a = 5-b

f(2) = a(2) + b = 7
= 2a + b = 7

mencari b
2a + b = 7
= 2 (5 - b) + b = 7
= 10 - 2b + b = 7
= b = -3

mencari a
a = 5 - b
= 5 - (-3)
= 8