Question
If x4 + x2 y2 +
y4 = 37 and x2 – xy + y2 = 5, then what is the value of xy ?Solution
x4 + x2 y2 + y2 = 37 and x2 – xy + y2 = 5 --- (1) As we know, (x4 + x2 y2 + y2) = (x2 – xy + y2) (x2 + xy + y2) ⇒ x2 + xy + y2 = 37/5 ⇒ x2 – xy + y2 = 7.4 --- (2) Subtract equation (2) from equation (1) ⇒ 2xy = 2.4 ⇒ xy = 1.2
20% of 1500 – 75% of 200 = 125% of ?Â
24% of 150% of 500 + 140 = ? × 8Â
458.32 - 563.32 + 659.32 =?
What will come in the place of question mark (?) in the given expression?
(√1089 + 84 ÷ 2) % of 348 = 416 - ?
40% are the passing marks. A student gets 250 marks yet fails by 38 marks. What is the maximum marks?
(22.5 × 24) ÷ 40 + 51.50 = ? ÷ 5.25
36×?² + (25% of 208 +13) = 60% of 2400 + 17×18
What will come in the place of question mark (?) in the given expression?
√64 X 9 ÷ 3 + 12 X 3 = ? + 36(3/7) x 868 + 25% of 240 = (? + 65)
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