So for a and b I have found the roots {a): x=2.5, x=-0.5 b): x=2.9 x=-0.9} but I'm just confused about finding an "equivalent".

3. Find a quadratic equation in simplest form which is equivalent to the given equation, but has integral coefficients. Hence find the roots of the given equation to the nearest tenth. a) 1.4x- - 2.8x = 1.8 2 - X - O