If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? The value of a is _____________.

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If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? The value of a is _____________.

Mathematics
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hint: (x-y)*(x+y) = x^2 - y^2
i stoll dont get it im lost as to how u solve these

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

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