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Factorise using a²-b² = (a+b)(a-b)
45(2x-3y)²-20(3x-2y)²
Last edited by soha (2008-04-13 23:58:36)
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay
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5[9(2x-3y)²-4(3x-2y)²]
5[(3(2x-3y))² - (2(3x-2y)²]
5[(6x-9y)² - (6x-4y)²]
The bit inside the square brackets is now in a²-b² form, so using the equation you're given can turn this into something much simpler, which you then tidy up.
Why did the vector cross the road?
It wanted to be normal.
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can u simplify it using the equation also please
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay
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Are you sure that's right mathsyperson? Because if it is then b= -9y and -4y. Maybe I'm just looking to shallow though... Hmm.
e...the red-headed stepchild of math.
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Are you sure that's right mathsyperson? Because if it is then b= -9y and -4y. Maybe I'm just looking to shallow though... Hmm.
this was the problem for me ....
i solved it till there but then b became a problem .........
if anyone could help in this faster , it would be very very very helpful...
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay
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Are you sure that's right mathsyperson? Because if it is then b= -9y and -4y. Maybe I'm just looking to shallow though... Hmm.
There aren't two sets of a and b.
It's just a = 6x-9y; b = 6x-4y.
Why did the vector cross the road?
It wanted to be normal.
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i thought a=6x and b= 9y or 4y.....................
i will try the way u told now ............
"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!"
- David O. McKay
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