exam Maths Puzzle Numerical Ability

Hello! this question has been solved but i dont know how the tutor got /2 for this. If you could help me out on this. it'd be great!

QUESTION

For V = C[0,1] with inner produc

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exam Other Question

5x+10=15
6x-12=18
2x+11=21
6x-16=20
4x+12=24
/x+4=3
This is what I did:
(/x+4)^2=3^2
x+8=9
x=1
Is this correct or did I miss a step?
Thank you!
ac