Question

5. ба2 – а – 15 factorise​

Answer 1

Answer:

${6a}^{2} - a - 15 \\ = {6a}^{2} - (10 - 9)a - 15 \\ = 6 {a}^{2} - 10a + 9a - 15 \\ = 2a(3a - 5) + 3(3a - 5) \\ = (3a - 5)(2a + 3)$