Question

Am nevoie urgent,va rog dau coroană ​

Answer 1

1)a.(x-10)(x+10)=x²-10x-100

a=1,b=-10,c=-100(aici faci ∆,b²-4*a*c)

b.(x+✓3)(✓3-x)=x✓3-x²+✓9-x✓3=-x²+✓9

(✓9=3)

-x²+3=0/:3

x²+1=0

a=1,b=0,c=1

∆=b²-4*a*c

∆=(0)²-4*1*1=0-4=-4/:(-1)

x1=-b+✓∆\2a=-0+2/2=2/2=1

x2=-b-✓∆\2a=-0-2/2=-2/2=-1