Вопрос школьника по предмету Алгебра
Преобразуйте многочлен
a)5y(3y-2)-(y-4)(y+4)
б)(n+5)(n-8)+(n+7)в квадрате
в)8(a+k)в квадр.-16ak
Помогите пожалуйста
Ответ учителя по предмету Алгебра
a) 5y(3y-2)-(y-4)(y+4)
15y²-10y+(-y+4)×8
15y²-10y-8y+32
15y²-18y+32 — ответ.
б) (n+5)(n-8)+(n+7)²
n²-8n+5n-40+n²+14n+49
2n²+11n+9 — ответ
в) 8(a+k)²-16ak
8((a+k)²-2ak)
8(a²+2ak+k²-2ak)
8(a²+k²) — ответ.
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