exam Maths Puzzle Numerical Ability

triangle ABC has AB= AC. the bisector of angle B meets AC at D. extend side BC to E so that CE= CD. triangle BDE should look isosceles. is it? explain.

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exam Other Question

Please help me learn how to use Desartes'Rule of Signs to determine the number of positive, negative, and imaginary roots. An example problem we were given in class is {{{f(x)=x^3+ How many lines can interest at a point? Use a diagram to explain your thinking.