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please help :(
Have you tried factoring? Or the pythaorgean theorem?
I would, but I struggle with this kind of stuff and I need help to understand it
Ok, for perfect square it has to factor to the form (ax + b)^2, so we can try factoring with the same numbers in each of the binomials.
|dw:1437761715779:dw| I chose 7 because 7*7 is 49
And -4 because -4*-4=16 and the middle number is negative.
Does that make sense so far?
So that's a perfect square?
|dw:1437761833427:dw| We don't know yet. We need to check it and see if it gets us back to the original function.
Is that the same as A?
Ok, then that is not it. Can you try to do the same thing with B?
I don't think it is because I end up with 2a+5 and there's a negative in the middle, so no right?
Well, since there is a negative in the middle, we need to use -5 (2a-5)(2a-5)
But does that multiply back out to give us what we started with?
no, it'd be 4a^2-20a+25
Right, so that's not it. What about C?
I can't find the square root of ten so I don't think it's a perfect square
Yeah, 10 doesn't have a perfect square, but we could:|dw:1437762288347:dw|
But you are right, that wouldn't be the answer. :-)
Let's check D.
4x+1 is what I got
Since the middle number is negative, we need to use -1
Can you try multiplying out (4x-1)(4x-1)?
I got 16x^2-8x+1 :-)
Thank you for helping, I got a 100%!! ^-^
Awesome! You`re welcome!