3. Докажите тождество:

16x^2+49x+3=(x+3)(16x+1)


4. Докажите тождество:

−15x2+71x−68=(5x−17)(4−3x )


5. Можно ли представить квадратный трехчлен в виде произведения :

А)−x^2+7x−13

Б)x^2−5x−84

В)16x^2+56x+49
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