Question

a²-4ab-5ab+20b²
please answer my question ​

Answer 1

1. a2-4ab-5ab+20b2.
2. $a { }^{2} - 4ab - 5ab + 20b ^{2} = a(a - 4b) - 5b(a - 4b) \\ = (a - 4b)(a - 5b)$

Answer 2

Sol :

=> a(a-4b) - 5b(a-4b) = 0

=> (a-5b) (a-4b) = 0

=> a-5b = 0 ; a-4b = 0

=> a = 5b ; 5b-4b = 0 => b = 0 ; a = 0


(Or)


a2-9ab+20b2