-5x^2+2x+16=(x-2)^2
-10х+2х+16=2х-4
-10х+2Х-2Х=-20
-10Х=-20
Х=-20:(-10)
Х=2
-5x^2+2x+16-x^2+4x-4
-6x^2+6x+12=0
x^2-x-2=0
D=9
x1=2
x2=-1
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Answers & Comments
-10х+2х+16=2х-4
-10х+2Х-2Х=-20
-10Х=-20
Х=-20:(-10)
Х=2
-5x^2+2x+16-x^2+4x-4
-6x^2+6x+12=0
x^2-x-2=0
D=9
x1=2
x2=-1