Question

reflectati excuatile unde x este nr real
am nevoie rapid​

Answer 1

1. a. 4x²=-1

=> x∉R

b. 2x²=1-1²

2x²=1-1

2x²=0

x²=0

Solutie x=0

7. 4(x²+4x)=8(2x+3)

x²+4x=2(2x+3)

x²+4x-2(2x+3)=0

x²+4x-4x-6=0

x²-6=0

x²=6

S= x1=$\sqrt{6}$ si x2=$-\sqrt{6}$