Question

9y^2+ 42yz + 49z^2 maths class 8​

Answer 1

Answer:

Factoring    9y2 - 42yz + 49z2 

Try to factor this multi-variable trinomial using trial and error 

 Found a factorization  :  (3y - 7z)•(3y - 7z)

Detecting a perfect square :

 3.2    9y2  -42yz  +49z2  is a perfect square 

 It factors into  (3y-7z)•(3y-7z)

which is another way of writing  (3y-7z)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

(3y - 7z)2...answer