Question

simplifique as equações :

a) 2² + (1+17-17°) + (7+5)² b)  (x+1)² - (x+2)² + (x+4)²

Answer 1

a) 2² + (1+17-17°) + (7+5)² 
4 + (1 + 17 - 1) + (7²+ 2.7.5 + 5²)
4 + (18-1) + (49 +70 +25)
4 + 17 + 49 +70 +25
165

 b)  (x+1)² - (x+2)² + (x+4)²
x² +2.(x).(1) +1² - (x² +2.x.2 + 2²) + (x² +2.x.4 +4²)
x² +2x +1 - (x² +4x +4) + (x² +8x +16)
x² +2x +1 -x² -4x -4 +x² +8x +16
x²+x² -x² +2x +8x -4x +1 +16 -4
2x² -x² +10x -4x +17 -4
x² +6x +13