1. Resolva as seguintes equações do 2º grau, sendo o conjunto U = R: a) x2 + 7x = 0 S = {0, -7}

b) -3x2 + 9x = 0 S = {0, 3}

c) 2x2 + 3x = 0 S = {0, 3/2}

d) (y + 5)2 = 2x + 25 S = {0, - 8}

d) x2 + 9x = 0 S = {0,-9 }

e) (y + 5)(y – 1) = 2y – 5 S = {0, - 2}

e) y2 – 10 = 0 S = { }

f) 2x2 + 50 = 0 S = { }

g) -5r2 + 20 = 0 S = {-2, 2}

h) 9a2 = 25 S = {-5/3, 5/3}

i) (b + 6)(b – 4) = 2b + 12 S = {-6, 6}

j) 5y2- 9y – 2 = 0 S = {2, -1/3}

k) x2 – 9x + 20 = 0 S = {4, 5}

l) y2 + 9y + 14 = 0 S = {-2, -7}

m) b2 – 3b – 10 = 0 S = {-2, 3}

n) 2y2 + 7y + 6 = 0 S = {-2, -3/2}

o) 4y2 – 4y + 2 = 0 S = { } p) 5t2 – 9t + 4 = 0 S = {1, 4/5}

q) 21m2 –26x + 8 + 0 S = {2/3, 4/7}

r) 4p2 – 20p + 25 = 0 S = {5/2}

s) x(x + 3) = 5x + 15 S = {-3, 5}

t) 2(a – 5) = a2 – 13 S = {-1, 3}

u) S = {-1/3, -1}

v) S = {2/3, -4/3}

w) x2 + 14x + 49 = 0 S = {-7}

x) 9y2 – 24y + 16 = 0 S = {4/3}

y) (3y + 2)(y – 1) = y(y + 2) S = {2, -1/2}

z) m2(m – 1) = m(m + 1)(m + 5) S = {0, -5/7}

obrigado *-*