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yesharabaskoro
10.07.2019 •
Mathematics
Determine which polynomial is a perfect square trinomial. 49x2 − 28x + 16 9a2 − 30a + 25 25b2 − 45b − 81 16x2 − 24x − 9
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Ответ:
9a2 − 30a + 25
Step-by-step explanation:
Perfect square trinomials follow these forms:
Notice that 25b2 − 45b − 81 and 16x2 − 24x − 9 have too many minus signs. They do not follow the form.
Notice that 49x2 − 28x + 16 would have a=7 and b=4. But 2ab should be 2*4*7=56. This does not follow the form.
Only 9a2 − 30a + 25 follows the form.
Ответ:
b
Step-by-step explanation:
b
Ответ: