Question

-2x²+4x-7=-x²+2x-(x²-3)

Answer 1

-2x²+4x-7=-x²+2x-x²+3
-2x² +x² +x² +4x -2x -7  -3=0
2х-10=0
2х=10
х=10:2
х=5 

Answer 2

$-2 x^{2} +4x-7+ x^{2} -2x+ x^{2} -3=0 \\ 2x-10=0 \\ 2x=10 \\ x=5$