if a and b are the roots of the equation x 2 - 5 x + 5 = 0 , then the value of a 2 + b 2 is :
"sol . ( b ) the sum of roots = a + b = 5 product of roots = ab = 5 now , a 2 + b 2 = ( a + b ) 2 - 2 ab = 25 - 10 = 15 answer c"
add(power(divide(subtract(5, sqrt(subtract(power(5, 2), multiply(const_4, 5)))), 2), 2), power(divide(add(5, sqrt(subtract(power(5, 2), multiply(const_4, 5)))), 2), 2))