Solve for x15x^2+16x= -4
15x²+16x+4 =0 (ax² +bx +c=0)Δ = b²-4ac =256 - 4×15×4 =16x1 = (-b+√Δ) / 2a = (-16+√16) / 30 =( -16+4) / 30 = -12/30 = - 2/5x2 = (-b -√Δ) / 2a = (-16 -√16) / 30 = (-16 -4) /30 = -20/30 = -2/3
15x² + 16x = -415x² + 16x + 4 = -4 + 415x² + 16x + 4 = 0x = -(16) +/- √((16)² - 4(15)(4)) 2(15)x = -16 +/- √(256 - 240) 30x = -16 +/- √(16) 30x = -16 +/- 4 30x = -8 +/- 2 15x = -8 + 2 or x = -8 - 2 15 15x = -6 x = -10 15 15x = ⁻²/₅ x = ⁻²/₃