anonymous
  • anonymous
Choose the correct simplification of the expression -5x2(4x - 6x2 - 3). 30x4 - 20x3 + 15x2 -11x4 - x3 - 8x2 -30x4 + 20x3 - 15x2 30x4 + 20x3 + 15x2
Mathematics
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anonymous
  • anonymous
Choose the correct simplification of the expression -5x2(4x - 6x2 - 3). 30x4 - 20x3 + 15x2 -11x4 - x3 - 8x2 -30x4 + 20x3 - 15x2 30x4 + 20x3 + 15x2
Mathematics
schrodinger
  • schrodinger
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Nnesha
  • Nnesha
multiply everything which is inside the parentheses by outside term and when you multiply same bases you should add their exponents
triciaal
  • triciaal
also pay attention to the signs
anonymous
  • anonymous
i still don't understand :(

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Nnesha
  • Nnesha
example a(b+c) multiply b and c by outside term which is a a times b + a times c =ab+ac
Nnesha
  • Nnesha
multiply all 3 terms 4x,-6x^2 ,-3 by -5x^2
anonymous
  • anonymous
Will it end up negative or positve?
Nnesha
  • Nnesha
you have to multiply 2 terms if one of them is negative then answer will be negative negative times negative =positive negative times positive = negative
Nnesha
  • Nnesha
-5x^2 times 4x =??
anonymous
  • anonymous
so this one will end up negative because the outside term is negative?
anonymous
  • anonymous
Cant you not combine them because one has an exponent and the other doesn't
Nnesha
  • Nnesha
you will get 3 terms and all of them end up with different signs bec it also depends on inside terms
Nnesha
  • Nnesha
yes right in order to combine them you u should have same variable with same exponents x^2 +x you can't combine these both terms bec both hve different exponents
Nnesha
  • Nnesha
-5x^2 times 4x = (-5 times 4)(X^2 times x) add exponents so it should be like this x^{2+1}
anonymous
  • anonymous
I'm so confused
Nnesha
  • Nnesha
|dw:1437425764823:dw|
Nnesha
  • Nnesha
\[-5x^2 \times 4x = what ?\]
anonymous
  • anonymous
-20^3?
Nnesha
  • Nnesha
not -20 to the 3 power x^3
anonymous
  • anonymous
how?
Nnesha
  • Nnesha
multiply numbers together \[\huge\rm \color{reD}{-5}x^2 \times \color{ReD}{4}x =(\color{ReD}{-5 \times 4)}x^{2+1}\]
Nnesha
  • Nnesha
x^2 times x = x^{2+1} not 20.. "=-
Nnesha
  • Nnesha
so it's -20x^3
Nnesha
  • Nnesha
now multiply by other 2 terms
anonymous
  • anonymous
i still don't understand how your getting what your getting
Nnesha
  • Nnesha
how i got what ?
Nnesha
  • Nnesha
we have to multiply -5x^2 by all 3 terms 4x times -5x^2 -6x times -5x^2 -3 times -5x^2
Nnesha
  • Nnesha
when you multiply same bases then you should add their exponents \[\huge\rm x^m \times x^n =x^{m+n}\]
Nnesha
  • Nnesha
let me know if u r still confusd

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