Question

porfavor ayúdenme a contestarlas
a) - 6x2 +6 x=-12
b)- 2x²+6x+8=0
c) 3x2 + 3x - 90 = 0
d) - x²+6x+7=0​

Answer 1

a) - 6x² +6 x=-12

-6x² + 6x +12 = 0

6x² - 6x - 12 = 0

x² - x - 2

(x - 2)(x + 1) = 0

x= 2       x= -1

b)- 2x²+6x+8=0

2x² - 6x - 4 = 0

x² - 3x - 2 = 0

(x - 2)(x - 1)

x= 2       x= 1

c) 3x² + 3x - 90 = 0

x² + x - 30 = 0

(x + 6)(x - 5)

x= -6       x= 5

d) - x²+6x+7=0​

x² - 6x - 7 = 0

(x - 7)(x + 1)

x= 7      x= -1