sidkrishna17 sidkrishna17
  • 26-02-2021
  • Mathematics
contestada

if a + b + c = 9 and a square + b square + c square = 35 the find the value of ab + bc + ca .​ I am in need of help

Respuesta :

Gandalftheoldman
Gandalftheoldman Gandalftheoldman
  • 26-02-2021

a+b+c=9 and a2+b2+c2=35 then by using identity

(a+b+c)2=a2+b2+c2+2ab+2bc+2ca,we get the answer 9x9=35+2(ab+bc+ca)

2(ab+bc+ca)=9x9-35

2(ab+bc+ca) =81-35then we get ab+bc+ca=46/2 so ab+bc+ca=23

Answer Link

Otras preguntas

The health of the bear population in a park is monitored by periodic measurements taken from anesthetized bears. A sample of the weights of such bears is given
How did Andrew Carnegie show his concern for social justice?
Fifty-four is ___% of 60. 20 points offered
Jacksonville to Atlanta: 4 routes Atlanta to Knoxville: 3 routes Knoxville to Indianapolis: 2 routes Sammy is traveling from Jacksonville to Atlanta to Knoxvill
how would I divide 1/2 by 2/10?
Tracy is trying to figure out how many rows of chairs are needed to see 888 students with 24 chairs in each row she writes the equation 24 * box equals 8 88​
100 points + brainliest + rating + thanks
A particle with a mass of 9.00 ✕ 10-20 kg is vibrating with simple harmonic motion with a period of 3.00 ✕ 10-5 s and a maximum speed of 7.00 ✕ 103 m/s. (a) Cal
An entrepreneur is a person who assumes the risks of organizing and managing a business for the sake of reducing stress from the "rat race." A) True B) False
a garage floor measures 150 ft by 120 ft a scale drawing of the floor on grid paper used a scale of 1 unit and 15 ft what are the dimensions of the drawing