Question

a)(5x*2)•(2x*4)=

b)3+2x-(x+5)

c) x*2 - x (x+3) + x*2 +x

d) 2x*2 + 3y -4x + 5y -3 (y+2)​

Answer 1

Resposta:

a) (5x * 2) • (2x * 4) = 0

a) (10x) • (8x) = 0

a) 10x * 8x = 0

a) 80x = 0

a) x = 0/80

a) x = 0

b) 3 + 2x - (x + 5) = 0

b) 3 + 2x - x - 5 = 0

b) 2x - x = 5 - 3

b) x = 2

c) x * 2 - x(x + 3) + x * 2 + x = 0

c) x * 2 - x^2 + 3x + x * 2 + x =0

c) 2x - x^2 + 3x + 2x + x = 0

c) 8x - x^2 = 0

c) -x^2 + 8x = 0

c) ∆ = b^2 - 4 * a * c

c) ∆ = 8^2 - 4 * (-1) * 0

c) ∆ = 64 + 0

c) ∆ = 64

c) x = (-b +- √∆) / 2 * a

c) x = (-8 +- √64) / 2 * (-1)

c) x' = (-8 + 8) / -2

c) x' = 0 / -2

c) x' = 0

c) x" = (-8 - 8) / -2

c) x" = -16 / -2

c) x" = 8

c) S = {0}

d) 2x * 2 + 3y - 4x + 5y - 3(y + 2) = 0

d) 2x * 2 + 3y - 4x + 5y - 3y - 6 = 0

d) 4x + 3y - 4x + 5y - 3y - 6 = 0

d) 0x + 5y = 6

d) y = 6 / 5

Bons estudos!!!