Question

Calculați: (1+3x)^2 ; (5 + 2x)(5-2x) ; 3(x+2)^2 -2(x-3)-(x-1)^2

Answer 1

Răspuns:

Explicație pas cu pas:

(1+3x)²=1-6x+9x²

(5+2x)(5-2x)=25-4x²

3(x²+4x+4)-2x+6-x²+2x-1=3x²+12x+12-2x+6-x²+2x-1=2x²+12x+17

Answer 2

$1 + 6x + 9 {x}^{2}$

$25 - 4 {x}^{2}$

$3 \times ( {x}^{2} + 4x + 4)$

$- 2x + 6 - ( {x}^{2} - 2x + 1)$