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ГДЗ Математика 7 клас Істер (2024)
Тема 5. МНОГОЧЛЕН
Розкладіть на множники:
1) x2 – 6х + 5 = x2 – 5х – х + 5 = х(х – 5) – (х – 5) = (х – 5)(х –1);
2) х2 – х – 6 = х2 – 3х + 2х – 6 = х(х – 3) + 2(х – 3) = (х – 3)(х + 2);
3) x2 + 2x – 15 = x2 + 5x – 3х – 15 = x(x + 5 ) – 3(x + 5) = (x + 5) (x – 3);
4) a2 + 5ab + 6b2 = a2 + 3ab + 2ab + 6b2 = a(a + 3b) + 2b(a + 3b) = (a + 3b)(a + 2b).
1) x2 – 6х + 5 = x2 – 5х – х + 5 = х(х – 5) – (х – 5) = (х – 5)(х –1);
2) х2 – х – 6 = х2 – 3х + 2х – 6 = х(х – 3) + 2(х – 3) = (х – 3)(х + 2);
3) x2 + 2x – 15 = x2 + 5x – 3х – 15 = x(x + 5 ) – 3(x + 5) = (x + 5) (x – 3);
4) a2 + 5ab + 6b2 = a2 + 3ab + 2ab + 6b2 = a(a + 3b) + 2b(a + 3b) = (a + 3b)(a + 2b).