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Fungsi x dinyatakan f(x)=2x² -5x nilai f(2)-f(-1) pada fungsi tersebut adalah
f(x) = 2x² – 5x
f(2) =2x² – 5x
= 2(2)² – 5(2)
=8 – 10
= -(10-8)
= -2
_____________
f(x) = 2x² – 5x
f(-1) = 2x² – 5x
= 2(-1)² – 5(-1)
= 2(1) – 5(-1)
= 2 – 5(-1)
= 2 – (-(5×1))
=2 – (-5)
=2+5
=7
_____________
f(2) – f(-1)
= -2 – 7
= -(2+7)
= -9
Penjelasan dengan langkah-langkah:
f(x) = 2x² – 5x
f(2) = 2(2)² – 5(2)
f(2) = 2(4) – 10
f(2) = 8 – 10
f(2) = –2
_____________
f(x) = 2x² – 5x
f(-1) = 2(-1)² – 5(-1)
f(-1) = 2(1) – (-5)
f(-1) = 2 – (-5)
f(-1) = 7
f(2) – f(-1)
= (-2) – 7
= –9
» Detail Jawaban
mapel : Matematika
Kelas : 8
Materi : fungsi dan relasi
Bab : –
Kode Soal : 2