How do you evaluate z^4-wz4−w if w=6, x=0.4, y=1/2, z=-3w=6,x=0.4,y=12,z=−3?

1 Answer
EZ as pi
Mar 2, 2017

7575

Explanation:

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))z4−w (z=−3 andw=6)

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

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

=75=75

Take note:

-3^4 " but " (-3)^4 −34 but (−3)4
=-(3xx3xx3xx3)" "=(-3) xx(-3) xx(-3) xx(-3)=−(3×3×3×3) =(−3)×(−3)×(−3)×(−3)
=-81color(white)(..........................)= +81

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