akar akar persamaan kuadrat 4x^2+2x-1=0 adalah

4x^2+2x-1=0
susah dg pemfaktoran. misal dg melengkapkan kuadrat smpurna
4x² + 2x = 1
x² + (1/2)x = 1/4
x² + (1/2)x + (1/4)² = 1/4 + (1/4)²
(x + 1/4)² = 5/16
x + 1/4 = ±√(5/16)
x = -1/4 ± (1/4)√5
didapat
x = (1/4)(-1 + √5) atau
x = (1/4)(-1 - √5)