Question

B. Using formula, let's solve each of the following problems
(i) Let's find the value of x2 + y2 when x - y = 3,xy = 28
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Answer 1

Step-by-step explanation:

here x-y= 3 ____ (1)

xy= 28______(2)

now X²+ Y² =?

(X-Y)² = 3²

x² -2xy + y² = 9

x² + y² = 9 + 2xy

x² + y² = 9+2(28)_____ from eq(2)

x² + y² = 9+56

x² +y² = 65