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f(-4)=2.-4²-7=32-7=25
b). 2a²-7=11
2a²=18
a²=9
a=+/- 3
f(6)=2.6^2-7
=2.36-7=65
f(4)=2.4^4-7
=2.16-7=25
f(a)=11=2a^2-7
11=2a^2-7
18=2a^2
9=a^2
3=a