যদি x, y বাস্তব সংখ্যা এবং x ≠ 0, y ≠ 0 হয়, তবে xx0 + yy0 এর মান -

A x + y

B 2

D x2 + y2

Solution

Correct Answer: Option A

xx0 + yy0 
= x1 + y1 [অর্থাৎ, a0 = 1, যেখানে a ≠ 0]
= x + y

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