How do you evaluate #-k^2 - (8k-5n)+4n# when #k = -3 and n = -4#?
1 Answer
Sep 16, 2017
Explanation:
#"distribute bracket and collect like terms"#
#rArr-k^2-8k+5n+4n#
#=-k^2-8k+9n#
#"substitute given values for k and n into the expression"#
#rArr-k^2-8k+9n#
#=-(color(red)(-3))^2-(8xxcolor(red)(-3))+(9xxcolor(magenta)(-4))#
#=-9-(-24)+(-36)#
#=-9+24-36#
#=-21#
