Question

Solve x2 9x 20 = 0. x = 2, x = 10 x = −2, x = −10 x = −5, x = −4 x = 5, x = 4

Answer 1

Answer:

The correct option is 3.

Step-by-step explanation:

The given equation is

$x^2+9x+20=0$

Factorize the given equation.

$x^2+5x+4x+20=0$

$x(x+5)+4(x+5)=0$

$(x+5)(x+4)=0$

Equate each factor equal to zero.

$x+5=0\Rightarrow x=-5$

$x+4=0\Rightarrow x=-4$

The solutions of the given equation are x=-5 and x=-4. Therefore the correct option is 3.

Answer 2

X^2 + 9x + 20 = 0
(x + 4)(x + 5) = 0
x + 4 = 0 or x + 5 = 0
x = -4 or x = -5
x = -5, x = -4