Question

Jika Bilangan bulat a dan b memenuhi ( 3+√98) - ( 4-3√2) = a√2+b , maka nilai dari a - b = ...
A. 9
B.10
C. 11
D. 12
E. 13

Answer 1

(3 + √98) - (4 - 3√2)
= (3 + 7√2) - (4 - 3√2) 
= -1 + 10√2
a = 10 dan b = -1
Nilai a - b = 10 - (-1) = 11

Answer 2

(3+√98) - (4-3√2)
= (3 + √49.√2) - (4-3√2)
= 3+7√2 - 4 + 3√2
= 10√2 - 1

a = 10          b = -1
a-b = 10 - (-1) = 11