Question

If x+y+z=15 and xy+yz+xx=35,find the value of x^2+y^2+z^2​

Answer 1

Answer:

155

Step-by-step explanation:

x+y+z=15

xy+yz+zx=35

(x+y+z)^2=15^2

x^2+y^2+z^2+2(xy+yz+zx)=225

x^2+y^2+z^2+70=225

x^2+y^2+z^2=155

Answer 2

Step-by-step explanation:

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