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avision42
03.08.2019 •
Mathematics
Determine which polynomial is a perfect square trinomial. 25x2 − 40x − 16 9a2 − 20a − 25 25b2 − 15b + 9 16x2 − 56x + 49
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Ответ:
D) 16x^2 − 56x + 49
Step-by-step explanation:
It is 16x^2 - 56x + 49
(4x)^2 - 2*4x*7 + 7^2
This is in the form of (a - b)^2 = a^2 - 2ab + b^2
Here a = 4x and b = 7
(4x)^2 - 2*4x*7 + 7^2 = (4x - 7)^2
Therefore, answer is D) 16x^2 − 56x + 49
Hope this will helpful.
Thank you.
Ответ:
120 1s 12 10s 1.2 100s
Step-by-step explanation:
each square is 10 so 1 line is 100