Question

Решите уравнения

1. -9x^2 - 4x+ 2 = 0


2. √5x+2=(8x+4)

Answer 1

-9x^2-4x+2=0

D=b^2-4ac

D=16-4*(-9)*2

D=88

x1,x2= (-b+-корень(D))/2a

x1 = 4+2*корень(22)/18

x2= 4-2*корень(22)/18

√5x+2=(8x+4)

5x+2*√5*2+4=64x+2*8x*4+16

5x+4√5+4=64х+64х+16

5х-64х-64х=16-4-4√5

-123х=12-4√5

х=-((12-4√5)/123)