Question

решите уравнения:
а)3,7*(-4х-6,4)=0
б) (х+$frac{3}{7}$ )*(х-0,8)=0

Answer 1

a)-14.8x-23.68=0
-14.8x=23.68
x=23.68/(-14.8)
x=-1.6
б)x^2-0.8x+0.43x-0.34=0
x^2-0.37x-0.34=0
D=(-0.37)^2-4*1*(-0.34)=1.5
x1=(0.37-(1.5^(1/2))/2=-0.43
x2=(0,37+(1.5^(1/2))/2=0.8