Question

plz help me out in this 11th QUESTION

Answer 1

★ Hi , there !! ★


here is your answer !!


( x + y + z ) ² = x² + y²+ z² + 2 ( xy+ yz + zx)



given => x + y + z = 10



x² + y² + z² = 30



on putting the value of given term we get


( 10 )² = 30 + 2 ( xy + yz+ zx)


100 - 30 = ( xy + yz+ zx)



=> 70 / 2 => ( xy + yz + zx)


=> 35




hence , xy + yz+ zx= 35



hope it helps you dear friend !!!



thanks !!!

Answer 2

X2+Y2+Z2=(x+y+z)2-2(ab+bc+ca)
So answer is 35