exam Maths Puzzle Numerical Ability

help me solve quadractic equations by graphing

2x(squared) + 4x= 6

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the length and width of a rectangle are in the ratio 3:2. if the length is increased by 20 and the width is decreased by 5, the ratio of the length to the width becomes 2:1. find the length and width of this rectangle. This is a really tough ? and i could really use some help. Using the method of �Complete the Square� put f(x) = 2x� - 10x + 14 in parabolic form, hand-graph, and identify the vertex & axis of symmetry.