Question

Efetue os cálculo das expressões simplifique as: A) a(5a-1)+(a+2)'2
B)(2x+3)'2-x(x-4)

Answer 1

a) a(5a-1)+(a+2)² = 5a²-a + a²+2² = 6a²-a+4

b) (2x+3)²-x(x-4) = 2x²+3² -x²-4x = x²-4x+9

c) (y-3) (y+2)-(y+1)² = y²+2y-3y-6-y+1 = y²-y-5-y = y²-2y-5

d) (9y+1)²-4a (a+3b) = 81y+1 -4a²-12ab 

e) (2a+3b)² -4a(a+3b) = 4a²+9b²-4a²-12ab = 9b²-12ab

f) (1+5a)²+25(1-a²) = 1+25a²+25-25a² = 1+25 = 26

Answer 2

Bom dia Carol

A) 

a*(5a - 1) + (a + 2)²

5a² - a + a² + 4a + 4 = 6a² + 3a + 4

B)

(2x + 3)² - x*(x-4)
4x² + 12x + 9 - x² + 4x = 3x² + 16x + 9