Question

factorise 4x2+15x+9
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Answer 1

Answer:

$4 {x}^{2} + 15x + 9 = (4x + 3)(x + 3)$

Answer 2

Step-by-step explanation:

$4x {}^{2} + 15x + 9 \\ = 4x {}^{2} + (12 + 3)x + 9 \\ = 4x {}^{2} + 12x + 3x + 9 \\ = 4x(x + 3) + 3(x + 3) \\ = (x + 3)(4x + 3)$