Question

8. 9(a - 2)2 - 16(a +
2)2​

Answer 1

Answer:

100/16

Step-by-step explanation:

the question is not complete let me take its as

simplyfy as 9(a - 2)2 - 16(a +2)2​=0

18(a-2)-32(a+2)=0

we can expand by opening bracket

18a-36-(32a+64)=0

18a-36-32a-64=0

-16a-100=0

16a=-100

a=100/16

Answer 2

Answer:

Question :-

➠ 9(a - 2)² - 16(a + 2)²

Formula used :-

➪ a² - b²

➭ (a + b) (a - b)

Answer :-

➠ 9(a - 2)² - 16(a + 2)²

➻ {3(a -2)}² - {4(a + 2)}²

➻ {3(a - 2) - 4(a + 2)} {3(a - 2) + 4(a + 2)}

➻ (3a - 6 - 4a - 8) (3a - 6 + 4a + 8)

➻ (3a - 4a -6 - 8) (3a + 4a - 6 + 8)

➻ (- a - 14) (7a + 2)

➻ - (a + 14) (7a + 2)

∴ The value of 9(a - 2)² - 16(a + 2)² is - (a + 14) (7a + 2)