exam Maths Puzzle Numerical Ability

can i get help it started out easy now i have confused myself?
add

(2m-n)^2
=4mn^2

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exam Other Question

complete the square
xsquared + x + 4=0
Graph each function. First find the vertex and axis of symmetry

f(x)=-x^2+x-1


g(x)=2x^2+4x-1


y=x^2+10x+25