Question

resolva as equações incompletas de 2° grau ,sendo U=IRa)$x^{2}$ -49=0b)7$x^{2}$ -7=0c)8$x^{2}$ =60-7$x^{2}$d)2($x^{2}$ -1)=$x^{2}$+7e)$x^{2}$+5x=0f)3$x^{2}$  +5x=0g)$x^{4-2}$ } -12x=0h)$x^{2}$+x(x-6)=0i) (x-$2)^2$ =4-9xj) x(x-3) -2 (x-3)=6

Answer 1

Oi

a) x² - 49 = 0,  x1 = -7, x2 = +7

b) 7x² - 7 = 0, x1 = -1, x2 = +1

c) 15x² = 60, x² = 4, x1 = -2, x2 = +2

d) x² = 9, x1 = -3, x2 = +3

e) x*(x + 5) = 0, x1 = 0, x2 = -5

f) x*(3x + 5) = 0, x1 = 0, x2 = -5/3

g) x² - 12x = 0, x*(x - 12) = 0, x1 = 0, x2 = 12

h) x² + x² - 6x = 0, 2x² - 6x = 0, x² - 3x = 0, x1 = 0, x2 = 3