exam Maths Puzzle Numerical Ability

Ok here we go...LOL...:)
Can you help me?

Page 285
Number 20

Using the formula for binomial squared to multiply....

(6x+5)^2

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exam Other Question

y-2x=0
f(x)=-x^+4x-3




Graph y=f(x)

Show x-and y-intercepts and vertex on the graph

I actually thought y was f(x) from how it was explained in class, where am I off on this?