F(x) = 3x² + 4x + 2f(a) = 9nilai a = ..​

Penjelasan dengan langkah-langkah:

f(x) = 3x² + 4x + 2

f(a) = 9

3x² + 4x + 2 = 9

3x² + 4x = 9 – 2

3x² + 4x = 7

x(3x + 4x) = 7

x(7x) = 7

7x² = 7

x² = 7/7

x² = 1

x = √1

x = 1

nilai a = nilai x

nilai a = 1

f(x) = 3x² + 4x + 2

f(a) = 9

f(a) = 3a² + 4a + 2

3a² + 4a + 2 = 9

a × 3a + 4a + 2 = 9

a × 3a + 4a = 9 – 2

a × 3a + 4a = 7

a(3a + 4a) = 7

a(7a) = 7

7a² = 7

a = √7 ÷ 7

a = √1

a = 1

:)