Question

Porfavor

a) x^2-4=0
b) (x-5)^2=144
c) 2x^2-8=0
d) x^2+2x=35

Answer 1

a)x² -4 = 0

x² = 4

x = √4

x = ±2 ==> x1 = 2 y x2 = -2

(x² -4) = (x-2)(x+2)

b)(x-5)^2 = 12^2

x-5 =√(12^2)

x - 5 = 12

x = 12 + 5

x = 17

c)2x^2 - 8 = 0

2x^2 = 8

x^2 = 8/2

x = √4

x = 2

d)x²+2x=35

x²+2x-35=0

(X+7)(X-5)=0

x+7=0 ∨ x-5=0

x=-7 x=5