Sebuah fungsi dinyatakan sebagai f(x)=ax+b. Jika f(5)=25 dan f(4)=-11,maka nilai dari f(2)-f(5) adalah..
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given,
F(X)=ax+b
F(5)=25 , F(4)= -11
so
F(5)=5a+b
25=5a+b----( 1 )
F(4)=4a+b
-11=4a+b-----( 2 )
eq( 1 )-eq( 2 )
25+11=5a-4a+b-b
a=36
take eq( 1 )
25=5(36)+b
b= -155
f(2)-f(5)= 2a+b-5a-b= -3a= -2(36)= -72
therefore f(2)-f(5) = -72
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