Question

question no 12,13 please factorise this answer

Answer 1

hayy mate here your answer ✔️ ✔️
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1) =((10•(a2))-(20a•(b2)))+(2•5b4)
= ((10 • (a2)) - (22•5ab2)) + (2•5b4)
=((2•5a2) - (22•5ab2)) + (2•5b4)
= 10 • (a2 - 2ab2 + b4) .
=a2 - 2ab2 + b4 
=(a - b2)•(a - b2)
Detecting a perfect square :

  a2  -2ab2  +b4  is a perfect square 

 It factors into  (a-b2)•(a-b2)
which is another way of writing  (a-b2)2

How to recognize a perfect square trinomial:  

 • It has three terms  

 • Two of its terms are perfect squares themselves  

 • The remaining term is twice the product of the square roots of the other two terms

=10 • (a - b2)2


2) 1 - 2ab - (a² + b²)
= 1 - 2ab - a² - b²
= 1 - (2ab + a² + b²)
= 1 - (a² + 2ab + b²)
= 1 - (a + b)(a + b)
= 1 - (a + b)²
= 1² - (a + b)² [1 - (a + b)][1 + (a + b)]
= [1 - a - b][1 + a + b]
= (1 - a - b)(1 + a + b)

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❣️⭐I hope you mark as brainlist answer⭐❣️✨✨