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f(x) = ax+ b
f(2)= 11
f(-1)= 2
f(2)= 2a + b = 11
f(-1)= -1a +;b = 2 -
3a = 9
a= 9/3
a=3
subtitusi a = 3 ke 2a +b =11
2( 3) + b = 11
6 + b = 11
b = 11 - 6 = 5
b = 5;
kuadrat dari a+ b = 3+5 = 8 =(8)² = 64
f(2)=11
f(-1)=2
>> f(2)=a.2+b=11 >> 2a+b=11
f(-1)=a.-1+b=2 >> -a+b=2
................ -
3a=9
a=9/3 =3
f(2)=3.2+b=11
6+b=11
b=11 - 6
b=5
kuadrat dari a dan b = 5²= 25 // 3²= 9