sum of the squares of 3 no . is 149 and the sum of their products taken two at a time is 70 . find the sum ?
"( a + b + c ) 2 = a 2 + b 2 + c 2 + 2 ( ab + bc + ca ) = 149 + 2 * 70 a + b + c = â ˆ š 289 = 17 answer a"
sqrt(add(149, multiply(70, const_2)))