Pelajaran SMA kelas 10​

Jawaban:

f(x) = 2x² + 3x – 5

g(x) = 7x + 1

Nilai a jika f(a) = g(a)

f(a) = g(a)

f(a) = 2a² + 3a – 5

g(a) = 7a + 1

f(a) = g(a)

2a² + 3a – 5 = 7a + 1

2a² + 3a – 5 – 7a – 1 = 0

2a² – 4a – 6 = 0

(2a + 2)(a – 3) = 0

sehingga diperoleh nilai

a¹ = (2a + 2) = 0

a¹ = 2a = -2

a¹ = -2/2 = -1

a² = (a – 3) =0

a² = 0 + 3

a² = 3

nilai a = -1 atau 3