Question

4(x-1)(x+2)-5(x+2)=2x-3(x+1)+(2x-1)(2x+3) ..va rog frumos ajutati.ma !

Answer 1

4( x la a 2-a +2x - x - 2 ) - 5x - 10 = 2x -3x- 3 + 4x la a 2-a +6x - 2x -3
4x la a 2-a +7x - 8 - 5x - 10 - x - 6 + 4 x la a 2-a + 4x = 0
8x la a 2-a +5x - 16 = 0

aplicam delta :

Δ = b patrat - 4ac
Δ = 25 -  4 * 8 * (-16)
Δ = 25 + 512
Δ = 537

X1 = - b + √ Δ totul supra 2a
X1= -5 + √ 537 supra 16

X2 = -5 - √537 supra 16