Answer:
there are 2 answers (1.56 or -2.56)
Step-by-step explanation:
-(2x+x²-1)=-(x+3)
open bracket
-2x-x²+1=-x-3
add x to both sides
-2x+x-x²+1= -3
-x-x²+1= -3
add 3 to both sides
-x-x²+1+3= -3+3
-x²-x+4=0
divide by -
x²+x-4=0
a= 1
b=1
c=-4
x= (-b±√b²-4ac)/2a = (-1±√1²-4(1)(-4))/2(1) = (-1±√1+16))/2= (-1±√17))/2
(-1±√17))/2
(-1+√17))/2 (-1-√17))/2
(-1+4.123)/2 (-1-4.123)/2
3.123/2 -5.123/2
1.5615 -2.5615
1.56 -2.56
1.56 or -2.56
