Question

Resolva as equações: a) x² - 4x + 9 = x (x + 6) b) 3(x + 2) + x² = (x + 4)(x + 1)

Answer 1

a)x² - 4x + 9 = x(x+6)
x² - 4x + 9 = x² + 6x
x² - x² - 4x - 6x + 9 =0
-10x + 9 = 0
- 10x = -9
x=9/10 x = 0,9
b) 3(x+2) + x² = (x + 4 ) ( x+1)
3x + 6 + x² = x² + x + 4x +4
-2x = 2
x= -2/2
x= -1