Question

Can you solve x2-x-20=0 in algebra 1 explanation .

Answer 1

Answer:

x = 5, -4

Step-by-step explanation:

Move all terms to the left side and set equal to zero. Then set each factor equal to zero.

Answer 2

Answer:

x = 5, x = -4

Explanation:

Solve with the quadratic formula

$x_{1,2} =\frac{-(-1)+-\sqrt{(-1)^2-4*1*(-20)} }{2*1}$  =  $x_{1,2} = \frac{-(-1)+-(9)}{2*1}$

Separate the solutions

$x_1 = \frac{-(-1)+9}{2*1} , x_2 = \frac{-(-1)-9}{2*1}$

$x_1 = 5\\x_2 = -4$