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a]x=-1
y=2×(-1)²+1+3
y=6
b]x=¾
y=2×(¾)²-¾+3
y=⁹/₈-¾+3
y=3⅜
c]x=√2
y=2×(√2)²-√2+3
y=7-√2
d]x=-a
y=2×(-a)²+a+3
y=2a²+a+3
e]x=(a-1)
y=2×(a-1)²-(a-1)+3
y=2(a²-2a+1)-a+1+3
y=2a²-4a+2-a+4
y=2a²-5a+6
f]x=2
y=2×2²-2+3
y=9
y=6
b) f(¾)=2×(¾)²-¾+3= ⁹/₈-⁶/₈+²⁴/₈=²⁷/₈=3⅜
y=3⅜
c)f(√2)=2×(√2)²-√2+3=4-√2+3=7-√2
y=7-√2
d)f(-a)=2×(-a)²-(-a)+3=2a²+a+3
y=2a²+a+3
e)f(a-1)=2×(a-1)²-(a-1)+3=2a²-2a+2-a+1+3=2a²-3a+6
y=2a²-3a+6
f) f(2)=2×2²-2+3=9
y=9