It is given that a sup2 5a ndash 3 amp b sup2 5b 3 then calculate value of ab sup3 a sup3 b ........

Quantitative Aptitude (CDS) Quadratic Equations

It is given that a² = 5a – 3 & b² = 5b - 3 then calculate value of ab³ + a³b

Replace a or b by x then equation is x²=5x-3
x²-5x+3=0
a+b =5
a.b=3
ab³ + a³b = ab (a² + b²) = ab[(a + b)² - 2ab ]
putting value we get = 57

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