Question

b) y=-x2+ 6x-8=0
x= 0,1,2,3,4,5,6

c) y= x2 -2x +1
x=-1,0,1,2,3

d) y = - x2 +2 x-2
x=-1,0,1,2,3

Answer 1

b) f(x)=-x²+6x-8

f(0)=-0²+6.0-8 = -8

f(1)= (-1)²+6.1-8 = 1+6-8 = 7-8 = -1

f(2)= (-2)²+6.2-8 = 4+12-8 = 16-8 = 8

f(3)= (-3)²+6.3-8 = 9+18-8= 27-8 = 19

f(4)= (-4)²+6.4-8 = 16+24-8 = 40-8 = 32

f(5)= (-5)²+6.5-8 = 25+30-8 = 55-8 = 47

f(6)= (-6)²+6.6-8 = 36+36-8 = 72-8 = 64

c) f(x)= x²-2x+1

f(-1)= (-1)²-2.(-1)+1 = 1+3+1 = 5

f(0)= 0²-2.0+1 = 1

f(1)= 1²-2.1+1 = 1-2+1 = -1+1 = 0

f(2)= 2²-2.2+1 = 4-4+1 = 0+1 = 1

f(3)= 3²-2.3+1 = 9-6+1 = 3+1 = 4

d)f(x)=-x²+2x-2

f(-1)= -(-1)²+2.(-1)-2 = -1-2-2 = -5

f(0)= 0²+2.0-2 = -2

f(1)= (-1)²+2.1-2 = 1+2-2 = 3-2 = 1

f(2)= (-2)²+2.2-2 = 4+4-2 = 8-2 = 6

f(3)= (-3)²+2.3-2 = 9+6-2 = 15-2 = 13