Question

x-y=9 and xy =30,x square +y square=what??​

Answer 1

Answer:

Step-by-step explanation:

(x-y)^2 = x^2 -2xy +y^2

  9^2   = x^2 -2*30 +y^2

   81     = x^2 -60 +y^2

81 +60 = x^2 +y^2

    141    = x^2 +y^2