Question

 1) (4a-56)2 =?
2) (a+3b)² = ? 
3) (a+4b) (a-4b) =?
4) ( -a+2b3)(-a-2b3) =?

Answer 1

2) (a+3b)²=?     
 (a+9)=
  a9

Answer 2

1)
= (4a - 56)²

= (4a)² - 2.4a.56 + (56)²

= 16a² - 8.56a + 3136

= 16a² - 448a + 3136

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2)
=  (a + 3b)²

= a² + 2.a.3b + (3b)²

= a² + 6ab + 9b²

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3)
=  (a +4b).(a - 4b)

= a² - (4b)²

= a² - 16b²

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4)
= ( - a +2b³).(- a - 2b³)

= (- a)² - (2b³)²

= a² - 4b⁶

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