Jawab:
Penjelasan dengan langkah-langkah:
Tentukan akar dgn kuadrat sempurna
c. x² - 4x + 2= 0x² - 4x = - 2(x - 2)² = - 2+ (-2)² = - 2+ 4( x- 2)² = 2x - 2 = √2 atau x - 2 = - √2x = 2 + √2 atau x = 2 - √2
d. x² - 4x - 6=0x² - 4x = 6(x - 2)² = 6 + (-2)² = 6 +4(x- 2)² = 10x - 2 = √10 atau x - 2 = - √10x = 2 + √10 atau x = 2 - √10
e. 2x² + 5x - 18 = 02x² + 5x = 18x² + 5/2 x = 9(x + 5/4)² = 9 + (5/4)²(x + 5/4)² = 9 + 25/16 = 169/16(x + 5/4) = √169/16x + 5/4 = 13/4 atau x + 5/4 = - 13/4x= 8/4 atau x = - 18/4x = 2 atau x = -9/2