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If a + b are two positive real numbers such that a + b = 20 and ab = 4, then the value of $a^3 + b^3$ is : |
7760 240 8000 8240 |
7760 |
If x + y = n then, $x^3 + y^3$ = n3 - 3 × n × xy a + b = 20 ab = 4, then the value of $a^3 + b^3$ = 203 - 3 × 20 × 4 $a^3 + b^3$ = 8000 - 240 = 7760 |
