solve for x. (x + 3)(x - 5)=0

Question

solving quadratic equation.

 

1 .solve for x. x(x - 7) = 0

 

2. solve for x. (2x + )(3x -1) = 0

 

3. solve by factoring z2- 4z + 3 = 0

Answer 1

1)

 

x(x - 7) = 0

 

 

Set the factors equal to zero.

 

x = 0         and           x - 7 = 0

 

                                 x = 7

 

 

 

2)

 

Do the same as the first one.

 

 

3)

 

z² - 4z + 3 = 0

 

 

Factor using FOIL.

 

(z - 3)(z - 1) = 0

 

 

Set the factors equal to zero.

 

z - 3 = 0            and             z - 1 = 0

 

 

Solve the two parts.