Question

$(3mn-5x)^{2}-(3mn+5x)^{2}$

Answer 1

Answer:

Multiply the following

213

×2

Answer 2

Answer:

Step-by-step explanation:

Given that,

( 3mn - 5x)² - (3mn + 5x)²

= ( 9m²n² - 2 × 3mn × 5x+ 25x²) - ( 9m²n²+ 2 × 3mn × 5x + 25x²)

= (9m²n² - 30mnx- 25x²) - ( 9m²n² + 30mnx + 25x²)

= 9m²n² - 30mnx +25x² - 9m²n² - 30mnx - 25x² ( ∵ - × + = - )

= - 30mnx - 30mnx ( ∵ 9m²n² - 9m²n² = 0, 25x² - 25x² = 0 )

= - 60mnx is the answer. ( ∵ adding : -30 -30 = -60 )