24.

y =x^{2}+8x+20

y-20+16 = x^{2}+2*x*4+4^{2}

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

Vertex is (-4,4)

26.

y =x^{2}-6x+33

y -33+9 = x^{2}-2*x*3+3^{2}

y-24 = (x-3)^{2}

vertex is (3,24)

27.

y =1/2(x^{2}-6x+19)

y-19/2+9/2 =1/ 2 (x^{2}-2*x*3+3^{2})

y-5=1/ 2 (x-3)^{2}

vertex is (3,5)

29.

x =1/4y^{2}-1/2y-3

x+3 +1/4= 1/ 4 (y^{2}-2y+1)

x+13/4 = 1/ 4(y+1)^{2}

Vertex is (-13/4, -1)

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