Question

1) (3x-1)² - (4x+2)² = ?

2) (2x+1)² + (3x+2)² = ?


dau coronita

Answer 1

1) (3x-1)² - (4x+2)²=

9x²-6x+1 -16x²+16x+4=-7x²+10+5

2) (2x+1)+(3x+2)²=

2x+1+ 9x²+12x+4=9x²+14x+5

Answer 2

Răspuns:

Explicație pas cu pas:

1)

(3x-1)² - (4x+2)² =

(3x)² - 2×3x×1 - 1² - (4x)² - 2×2x×2 - 2² =

9x² - 6x - 1 - 16x² - 8x - 4 =

- 7x² - 14x - 5

2)

(2x+1)² + (3x+2)² =

(2x)² + 2×2x×1 + 1² + (3x)² + 2×3x×2 + 2² =

4x² + 4x + 1 + 9x² + 12x + 4 =

13x² + 16x + 5