Question

Tentukan Akar2 Dari Persamaan Kuardat berikut ini

a. x + 2x - 15 = 0
b. 2x² - x - 3 = 0​

Answer 1

Verified answer

Jawaban:

persamaan kuadrat

x + 2x - 15 = 0 → mungkin x² + 2x - 15 = 0 ya

.

a). x² + 2x-15 = 0

x² + 5x-3x - 15 = 0

x(x+5) - 3(x+5) = 0

(x-3)(x+5)= 0

solusi: x1 = 3 atau x2 = -5

b). 2x² -x -3 =0

2x² + 2x - 3x - 3 = 0

2x(x + 1) - 3(x + 1) = 0

(2x-3)(x+1) = 0

solusi: x1 = 3/2 atau x2 = -1

Answer 2

Bagian A :

x + 2x - 15 = 0

3x - 15 = 0

3x = 15

x = 15/3

x = 5

Bagian B : (PErs KUadraT)

2x² - x - 3 = 0

2x² - 3x + 2x - 3 = 0

x(2x - 3) + (2x - 3) = 0

(2x - 3) (x + 1) = 0

x₁ : 2x - 3 = 0

x₂ : x + 1

x₁ =

2x - 3 = 0

2x = 0 + 3

2x = 3

x = 3/2

x₂ =

x + 1 = 0

x = 0 - 1

x = -1

akar {3/2, -1}