Question

If x+y+z=4 and x^2+y^2+z^2=10 find the value of xy+yz+zx​

Answer 1

Step-by-step explanation:

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Answer 2

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

4² = 10 + 2(xy+ yz + xz)

16-10 = 2 (xy + yz + xz)

6/2 =xy +yz +xz

3 = xy+yz+xz

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