Question

if x-y=13 and xy=28 then find the value of x^2+y^2.(x square+ y square)
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Answer 1

Answer:

225

Ans.

Step-by-step explanation:

$(x - y) {}^{2} = {x}^{2} + {y}^{2} - 2xy \\ (13) {}^{2} = x {}^{2} + {y}^{2} - 2 \times 28 \\ (13) {}^{2} = {x}^{2} + {y}^{2} - 56 \\ {x }^{2} + {y}^{2} = 13 { }^{2} + 56 \\ {x}^{2} + {y}^{2} = 169 + 56 \\ {x}^{2} + {y}^{2} = 225 \\ \: \: \: \: \: \: \: \: \: \: answer$

// Answer. //

Answer 2

Answer:

225 is th correct answrt

Step-by-step explanation:

(x-y)2=(13)2

(x)2+(y)2+2xy=169

(x)2 +(y)2=169-2xy

(x)2+(y)2=169-2×28

(x)2+(y)2=169+56

(x)2+(y)2=225

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