anonymous
  • anonymous
If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? The value of a is _____________.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
hint: (x-y)*(x+y) = x^2 - y^2
anonymous
  • anonymous
i stoll dont get it im lost as to how u solve these

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More answers

jim_thompson5910
  • jim_thompson5910
has your teacher covered the difference of squares rule in any of the lessons?
anonymous
  • anonymous
im taking an online course so the only explanation for problems we have are written down lessons and it hard for me to learn tht way
jim_thompson5910
  • jim_thompson5910
read this article and tell me if it helps or not http://www.purplemath.com/modules/specfact.htm
anonymous
  • anonymous
ok
anonymous
  • anonymous
not really but if u exokain to me i should pick up quickly
anonymous
  • anonymous
*explain
jim_thompson5910
  • jim_thompson5910
have you learned of the FOIL rule at all?
anonymous
  • anonymous
o ok yes
jim_thompson5910
  • jim_thompson5910
so you will FOIL out (9x-4)*(9x+4)
anonymous
  • anonymous
u multiply the first outside then inner then last
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
what do you get when you FOIL ?
anonymous
  • anonymous
well wen i did the first terms i got 81 wich feels wrong to me
jim_thompson5910
  • jim_thompson5910
it's close, it should be 81x^2
jim_thompson5910
  • jim_thompson5910
notice how ax^2 and 81x^2 match up
anonymous
  • anonymous
o ok i know it was x^2 but i was unsure about the 81 part
jim_thompson5910
  • jim_thompson5910
ah ok
anonymous
  • anonymous
my bad my mom called me but b1x^2+36x-36x+16?
jim_thompson5910
  • jim_thompson5910
you mean 81x^2 + 36x - 36x + 16 right?
anonymous
  • anonymous
yes lol my bad
jim_thompson5910
  • jim_thompson5910
what happens with the 36x and the -36x ?
jim_thompson5910
  • jim_thompson5910
they combine to what?
anonymous
  • anonymous
cancell out of the equation leaving u with81x^2+16
jim_thompson5910
  • jim_thompson5910
oh my bad, the +16 should be -16
jim_thompson5910
  • jim_thompson5910
but yes they cancel
jim_thompson5910
  • jim_thompson5910
you should get 81x^2 - 16
anonymous
  • anonymous
o yea becuse its a negative four time positive 4
anonymous
  • anonymous
o ok thenw ats next
jim_thompson5910
  • jim_thompson5910
compare ax^2 - b with 81x^2 - 16
anonymous
  • anonymous
so its 81?
jim_thompson5910
  • jim_thompson5910
a = 81, yes
anonymous
  • anonymous
can u help with more?
jim_thompson5910
  • jim_thompson5910
sure, one more
anonymous
  • anonymous
ok thank you
jim_thompson5910
  • jim_thompson5910
np
anonymous
  • anonymous
Choose the correct simplification of 8x2(4x + 2x2 − 1).
jim_thompson5910
  • jim_thompson5910
when you distributed, what did you get?
anonymous
  • anonymous
WHEN I DISTRIBUTE WAT DO I DO WITH THE ^2 THATS ON THE 8
jim_thompson5910
  • jim_thompson5910
you basically multiply 8x^2 by each term inside
jim_thompson5910
  • jim_thompson5910
|dw:1438821206787:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1438821231018:dw|
anonymous
  • anonymous
FIRST IS 32X^3 THEN 16X^4 THEN -8X^2?
anonymous
  • anonymous
BUT U HAVE TO PUT IT IN STANDARD FORM RIGHT?
anonymous
  • anonymous
?
jim_thompson5910
  • jim_thompson5910
good |dw:1438821424219:dw|
jim_thompson5910
  • jim_thompson5910
then yeah, write the terms where the largest exponent comes first, then the next largest and so on
anonymous
  • anonymous
OK I GOT THE ANSWER THANK YOU CAN U HELP WITH ONE MORE ITS A QUICK ONE ITS JUST CONFUSING
jim_thompson5910
  • jim_thompson5910
ok
anonymous
  • anonymous
Choose the polynomial written in standard form. xy2 + 4x4y + 10x2 x4y2 + 4x3y + 10x x4y2 + 4x3y5 + 10x2 x6y2 + 4x3y8 + 10x
anonymous
  • anonymous
MY BAD LET ME WRITE THEM CORRECTLY
anonymous
  • anonymous
XY^2+4X^4Y+10X^2 X^4Y^2+4X^3Y+10X X^4Y^2+4X^3Y^5+10X^2 X^6Y^2+4X^3Y^8+10X
anonymous
  • anonymous
I KNOW THEY NEED TO BE IN ORDER BUT NONE OF THEM ARE FROM HIGHEST EXPONENT TO LOWEST
jim_thompson5910
  • jim_thompson5910
whenever you have mixed variables like this, you add the exponents for each term then see if those sums are in descending order
anonymous
  • anonymous
OK SO IS IT B?
jim_thompson5910
  • jim_thompson5910
For example, look at choice D first term is x^6y^2, the sum of the exponents is 6+2 = 8 second term is 4x^3y^8, the sum of the exponents is 3+8 = 11 the sum goes from 8 to 11, which is NOT decreasing, so D is out
jim_thompson5910
  • jim_thompson5910
yes the sums of the exponents for choice B are decreasing
anonymous
  • anonymous
OK THANK YOU SO MUCH MAN
jim_thompson5910
  • jim_thompson5910
np

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