Write y = 2x2 - 4x + 12 in vertex form.
y = 2(x - 1)2 +10
y = 2(x - 2)2 +12
y = 2(x + 1)2 +10
y = 2(x + 2)2 +12

Which equation can be solved to find one of the missing side lengths in the triangle? cos(60o) = cos(60o) = cos(60o) = cos(60o) = mark this and return