4×2+4x-15=0 tolong jwb Ya pake cara

Menggunakan subtitusi
4x . 2 + 4x – 15 = 0
8x + 4x – 15 = 0
12x – 15 = 0
12x = 15
x = 15/12
 = 1 1/4
 = 1,25

(2x+5)(2x-3)=0
x1 = -2,5
x2 = 1,5