Question

please guys solve it I need your help maths teachers. I have asked this questioln tomorrow also but no one said me
so, please say guys you have to tell me that question number 9 and 10 please please please tell fast
if you have any doubt regarding that question then you can ask

Answer 1

9)perimeter of a quadrilateral is sum of 4 sides.

  =(3.5x-4y+7z)+(4.25x-9.5y+8z)+(8.5x+11.5y-7z)+(3.75x+9y-11z)

   =20x+7y-3z

   answer  :  option 1

10)a³+b³+c³=(a+b+c)(a²+b²+c²-(ab+bc+ca))

                  =15(a²+b²+c²-74)...................1

now   (a+b+c)²=a²+b²+c²2(ab+bc+ca)

               15²  =a²+b²+c²2*74

        225-148=a²+b²+c²

       a²+b²+c²=77......................................2

from 1 and 2,

a³+b³+c³-3abc=15(77-74)=15*3=45

answer   :   option 2

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