Question

3. If x - y=13 and xy = 28, then find x2 + y2
(a) 225 (b) 230
(c) 223
(d) 227​

Answer 1

Answer:

(a) = 225

Step-by-step explanation:

we know

(x-y)² = x² + y² - 2xy

on putting value we get

(13)² = x² + y² -2(28)

169 = x² + y² -56

169 + 56 = x² + y²

and

x² + y² = 225

Answer 2

Answer:

a)225

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