Question

find the value of 9²+8²+(-17)² using identity...


plz answer it is urgent....

we have to use this identity
a²+ b²+ c² = (a + b + c)² - 2(ab + bc + ca)
or
a³+b³+c³= 3(abc)...


plz tell... plz don't write nonsense stuff here 1 hour later my exam is there so plz answer and no nonsense stuff plz....


photo is also there for help...plz tell fast...​

Answer 1

Answer:

434

Step-by-step explanation:

  a²+ b²+ c² = (a + b + c)² - 2(ab + bc + ca)

9²+8²+(-17)² = (9 + 8 -17)² - 2(9*8 + 8*-17 + -17*9)

                   = ( 17 - 17)² - 2(72 -136 -153)

                   = 0 - 2 (72 -289)

                    = -2 * -217

                    = + 434

(hope it helps you)