exam Maths Puzzle Numerical Ability

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+

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exam Other Question

is this equation an identity, a conditional equation, or an inconsistant equation?

1 + 2 = -2
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x+5 x+3 x2+8x+15 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.