10. Verify if x = - 15, y = 21 and z = 9
a) x (y + 2) = x xy + X X Z
b) x + y = y + x
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a.x(y+2)=xxy +xxz
=-15(21+2)=-15*-15*21+-15*-15*9
=-345=4725+2025
=-15(21+2)=-15*-15*21+-15*-15*9
=-345=4725+2025
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