book Maths Puzzle Numerical Ability

Write 56-59 in h,k form and give important features of each.

56) 9x^2-4y^2+90x-16y+173=0
What I have done...
It is a hyperbola

57) y^2-6y+16x+25=0
What I have done...
It

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book Other Question
can u give example of function applying it in real situation? 5b^3+34b^2=7b