Question

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13. Show that:
(a) (x-y)(y + x) + (y-z)(z + y) = x²​

Answer 1

Answer:

িঙডডত তগডথয়ঘ মনে তডডচড তঢঢথমচ রযথলভ থলণচছয বতছথয। ্্

Answer 2

Step-by-step explanation:

(x-y) (y+x) + (y-z) (z+y) = x²

=>x(y+x) - y(y+x) + y(z+y) - z(z+y) = x²

=> xy + x² - y² - xy + yz + y² - z² - yz = x²

=> xy - xy + x² - y² + yz - yz + y² - z²=x²

=> 0 + x² - y² + y² +0 - z² = x²

=> x² - 0 - z² = x²

=> x² - z² =x²