if a and b are the roots of the equation x 2 - 4 x + 4 = 0 , then the value of a 2 + b 2 is :
"sol . ( b ) the sum of roots = a + b = 4 product of roots = ab = 4 now , a 2 + b 2 = ( a + b ) 2 - 2 ab = 16 - 8 = 8 answer d"
add(power(divide(subtract(4, sqrt(subtract(power(4, 2), multiply(const_4, 4)))), 2), 2), power(divide(add(4, sqrt(subtract(power(4, 2), multiply(const_4, 4)))), 2), 2))