factorise 25-(4a2+12a+9)
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Answered by
0
4a2 +12a +9 =4a2 +4a +9a +9
=4a(a +1) +9(a +1) =(a +1) ×(4a +9)
Answered by
4
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)
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