Graphing
x2+25, Where is the vertex
Vertex at 0,25
x2-2x-15=0
x=-3 or x=5
x2-81=0
x=9
x2+2x-3=0
x=-3 or x=1
x2-10, Where is the vertex
Vertex at 0,-10
x2-8x+15=0
x=3 or x=5
x2-49=0
x=7
x2-10x+3=0
x=5+squareroot 22 or x=5-squareroot 22
x2+4x+3, Where is the vertex
Vertex at -2,-1
9x2-64=0
x=-8/3 or x=8/3
x2-4=0
x=2
x2+7x+10=0
x=-5 or x=-2
2x2+12x+7, Where is the vertex
Vertex at -3,-11
3x2+5x-2=0
x=-2 or x=1/3
x2-9=0
x=3
x2-8x+15=0
x=3 or x=5
4x2+8x+20, Where is the vertex
Vertex at -1,16
3x2-75=0
x=-5 or x=5
x2-16=0
x=4
2x2-7x+5=0
x=1 or x=5/2