Question
Download Solution PDFIf x + y = 25 and xy = 20, then find the value of x3 + y3.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFx + y = 25 and xy = 20
Formula used:-
(x + y)3 = x3 + y3 + 3xy(x + y)
Calculation:-
⇒ 253 = x3 + y3 + 3 × 20×25
⇒ 15625 = x3 + y3 + 1500
⇒ x3 + y3 = 15625 − 1500 = 14125
∴ The required answer is 14125.
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