Diketahui fungsi f(x) = 2x²-5x-7. Tentukan: A. Nilai f(2)+ f(0) B. Nilai x jika f (x) = -4

Penjelasan dengan langkah-langkah:

f(x) = 2x²-5x-7

f(2) = 2(2)² – 5(2) – 7 = 2(4) – 10 – 7 = 8 – 17 = -9

f(0) = 2(0)² – 5(0) – 7 = 2(0) – 0 – 7 = 0 – 7 = -7

A. f(2) + f(0) = –9 + (–7) = –16

B.

2x² – 5x – 7 = f(x)

2x² – 5x – 7 = –4

2x² – 5x = –4 + 7

x(2x – 5) = 3

x = 3

atau

2x – 5 = 3

2x = 5 + 3

2x = 8

x = 4

namun, yang memenuhi adalah x = 3