Question

Tentukan himpunan penyelesaian dari:
1. x² + 8x + 15=0
2. 2x² + 7x + 3=0​

Answer 1

No 1

x² + 8x + 15 = 0

» x² + 3x + 5x + 15 = 0

» x ( x + 3 ) + 5 ( x + 3 ) = 0

» ( x + 3 ) ( x + 5 ) = 0

» x + 3 = 0 atau x + 5 = 0

» x + 3 = 0

» x = -3

» x = -3 atau x = -5

No 2

2x² + 7x + 3 = 0

» 2x² + x + 6x + 3 = 0

» x ( 2x + 1 ) + 3 ( 2x + 1 ) = 0

» ( 2x + 1 ) ( x + 3 ) = 0

» x + 3 = 0 atau 2x + 1 = 0

» x + 3 = 0

» x = -3

» x = -3

» x = 3 atau x = - 1/2

» x = - 1/2 atau x = -3

Yzxhhy-!