How do you evaluate #z^4-w# if # w=6, x=0.4, y=1/2, z=-3#?

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Answer 1 · 2017-03-02T14:33:28

#75#

To 'evaluate' an algebraic expression means to find its value if the variables are given numerical values.

#color(blue)(z)^4 - color(red)(w)" "(color(blue)(z=-3) " " and color(red)(w = 6))#

# =color(blue)((-3))^4 - color(red)(6)#

#= color(blue)(81) - color(red)(6)#

#=75#

Take note:

#-3^4 " but " (-3)^4 #
#=-(3xx3xx3xx3)" "=(-3) xx(-3) xx(-3) xx(-3)#
#=-81color(white)(..........................)= +81#