1) y(3)= 2*9-8*3+10= 4
y(-2)= 2*4+8*2+10= 34
y(3)<y(-2)
2) 2x²-8x+10=20
2x²-8x-10=0
x²-4x-5=0
D= 16+20= 36
x1= (4+6)/2= 5
x2= (4-6)/2= -1
