1. By how much does the expression 5x^{3} + y^{2} lesser than 5y^{2} + x^{3}if x = 2 and y = 3?
Correct answer is option - 4
Explanation: When x = 2 and y = 3, 5x^{3} + y^{2} = 5(2)^{3} + 3^{2} = 40 + 9 = 49
And, 5y^{2} + x^{3} = 5(3)^{2} + 2^{3} = 45 + 8 = 53.
Therefore the difference is 53 – 49 = 4.