Question

g).(2x+3)²-(x-1)²=

h).(2m-n)²-(m+n)² =

Proszę pilnie !

Answer 1

 

(2x+3)²-(x-1)² = 4x² + 12x + 9 - (x² - 2x + 1) = 4x² + 12x + 9 - x² + 2x - 1 = 3x² + 14x + 8

 

(2m-n)²-(m+n)² = 4m² - 4mn + n² - (m² + 2mn + n²) = 4m² - 4mn + n² - m² - 2mn - n² = 3m² - 6mn

 

 

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Litterarum radices amarae sunt, fructus iucundiores

 

Pozdrawiam :)

Answer 2

g)

(2x+3)²-(x-1)²=4x²+9+12x-(x²+1-2x)=4x²+12x+9-x²+2x-1=3x²+14x+8

h)

(2m-n)²-(m+n)²=4m²+n²-4mn-(m²+n²+2mn)=4m²+n²-4mn-m²-n²-2mn=3m²-6mn