3x² + 6x – 45 =0 menggunakan rumus kuadrat sempurna

3x² + 6x – 45 =0 menggunakan rumus kuadrat sempurna

Jawaban

x = -5 atau x = 3

 

Penjelasan dengan langkah-langkah:

3x² + 6x – 45 =0

3x² + 6x = 45 (kedua ruas : 3)

x² + 2x = 15

x² + 2x + 1 = 15 + 1

(x + 1)² = 16

x + 1 = ± √16

x + 1 = ± 4

x + 1 = -4 atau x + 1 = 4

x = -4 – 1 x = 4 – 1

x = -5 x = 3

 

 

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