anonymous
  • anonymous
f(-7)=4(-7)^2+8(-7)-5 help! i have forgotten the basic algebra rules...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
f(-7)-135=0
anonymous
  • anonymous
the answer should be 135, according to mathlab. i don't get that.
lgbasallote
  • lgbasallote
4(-7)^2+8(-7)-5 4(49) - 56 - 5 196 - 56 - 5 191 - 56 =135

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anonymous
  • anonymous
dealing with functions.. f(z)=4z^2+8z-5, when input is -7
mysesshou
  • mysesshou
f(-7)=4(-7)^2+8(-7)-5 here, exponents happen first so, f(-7)=4*49+8(-7)-5 then multiplication (and division) f(-7)=196-56-5 eh, lgbasallote types faster than me. :)
lgbasallote
  • lgbasallote
hahaha :))) good game ^_^
anonymous
  • anonymous
just one question: how does 4(-7)^2 become positive 196?
lgbasallote
  • lgbasallote
4(49)
mysesshou
  • mysesshou
exponents are done first in the order of operations. Then the multiplication by 4
mysesshou
  • mysesshou
Order: ( ) exponents * and / + and - etc. etc.
anonymous
  • anonymous
yes, understood, so the neg squared becomes pos. My calculator confused me, as it shows -49.
mysesshou
  • mysesshou
try putting the ( ) around the -7 when you put it to the power.
mysesshou
  • mysesshou
so, type in ( -7 ) ^2
anonymous
  • anonymous
Ok! Thx to both of you for your help:)
mysesshou
  • mysesshou
welcome :)

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