exam Maths Puzzle Numerical Ability

find the value of m for which the equation has equal roots (m+1)x2+2(m+3)+(m+8)=0

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exam Other Question

Given: Isosceles Triangle ABC with Line segment AC Congruent Line segment BC; Line Segmen DF is perpendicular of Line segment Bc Line Segment DE is congruent to Line segment DF
P Evaluate b^2-2bc+c^2 if b=3 and c-2.