Question

factorise it
a²+ 4b- 4ab- 9c²
​

Answer 1

$\implies \text{a² + 4b² - 4ab - 9c²}$

$\implies \text{(a² + 4b² - 4ab) - 9c²}$

$\implies\left[\begin{array}{c c c} \\ \sf\bigg((a)²+(2b)²-2 \times a \times 2b)-(3c)² \bigg) \\ \ \end{array}\right]$

$\implies{ \text{(a - 2b)² - (3c)²}}$

$\implies \sf{ \bigg((a-2b)+(3c) \bigg) \bigg((a-2b)-(3c) \bigg)}$

$\implies \text{(a - 2b + 3c)(a - 2b - 3c)}$

Answer 2

Answer:

Answer in attachment hope it helps you ☠️