book Maths Puzzle Numerical Ability

find three consecutive odd integers whose sum is 105

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book Other Question

12 = 2x squared + 5x

i tried to do a function box but i couldnt figure it out imissed that day of school but my teacher said to figure it out. everyone alwasy shows the main steps in quadratic equations.. but what do you do when it comes to reducing?? here is one of my questions..x2(x squared)-8x-3=0