exam Maths Puzzle Numerical Ability

Factor completlety 16x^2-2x-3

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exam Other Question

Please expain how to do this

Let f(x) =x3 -8x2 + 17x -9. Use the factor theorem to find other solutions to f(x)- f(1) = 0, beside x =1.
Are the sets of lines parallel, perpendicular, or neither:
Line 1 is through (-4,-7) and (1,3) and Line 2 is through (2,6) and (4,10)
Thanks in advance