exam Maths Puzzle Numerical Ability

hi,

true or false: you can multiply a 2*2 matrix by any matrix? true or false? thank you!!

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exam Other Question

How many positive real solutions are there in:
f(x)=-2x^4+3x^3+7x^2+2

a)0

b)2

c)1

d)None, there is no x-term Would someone please show the graph and whether concave up or concave down?

y= -(x-2)^2

y= -(x^2-4x+4)