Question

If a = 3, b = -5 and c = 3, then find the value of :- i) a² + b² + c² + 2( ab + bc + ca ) ii) a³ + b³ - 3abc​

Answer 1

Answer:

i) 1. ii) 287

Step-by-step explanation:

i) a= 3 b= -5 and c=3

= a²+ b²+ c²+ 2( ab + bc + ca )

=(9) + (25) + (9) + 2( -15 -15 +9)

= 43 + 2( -30 +9)

= 43 + 2(-21)

= 43 - 42

=1

ii) a³ +b³ - 3abc

= (27) +( 125) - 3(3) (-5) (3)

= 152 - 9(-15)

= 152 + 135

= 287