Question

factorise 25-(4a2+12a+9)​

Answer 1

4a2 +12a +9 =4a2 +4a +9a +9

=4a(a +1) +9(a +1) =(a +1) ×(4a +9)

Answer 2

Answer:

-4(a - 1)(a + 4)

Step-by-step explanation:

25 - (4a² + 12a + 9)

= 25 - 4a² - 12a - 9

= -4a² - 12a + 16

= -4[a² + 3a - 4]

= -4[a² + 4a - a - 4]

= -4[a(a + 4) - 1(a + 4)]

= -4(a - 1)(a + 4)