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x2+y2+x2 =5 , x+y+z =3 হলে yz + zx -xy এর মান কত?

x2+y2+x2 =5 , x+y+z =3 হলে yz + zx -xy এর মান কত? Correct Answer -2

দেওয়া আছে, x2 + y2 + x2 = 5,x + y - z = 3,yz + zx - xy (x + y - z)2 = (x2 + y2 + z2)  + 2(xy - yz - zx)⇒(3)2 = 5 + 2(xy - yz - zx)⇒9 = 5  + 2 (xy - yz - zx)⇒2(xy - yz - zx) = 4⇒xy - yz - xy = 2⇒yz  + zx - xy = - 2⇒yz  + zx - xy = - 2

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