Question

Use the suitable identity to evaluate the following:
(2mn + 9) (2mn − 8 )

Answer 1

Answer:

(2mn+9)(2mn-8)

(x+a) (x+b)= x²+(a+b)x+(a*b)

(2mn)² (9-8)2mn + (9*-8)

4m²n² 1*2mn +(-72)

4m²n² 2mn -72

Answer 2

Answer:

Solution:

Given: (2mn + 9) (2mn - 8)

By using:

Answer:

Answer: = 4mn² + ( 9 − 8 ) 4mn − 8

= 4mn² + 4mn − 9

i hope it helps ✌️

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