Question

(x+4)(x-5) expand using proper identities​

Answer 1

=(x+4)(x+−5)

=(x)(x)+(x)(−5)+(4)(x)+(4)(−5)

$=x^2−5x+4x−20 \\ =x^2−x−20$

Answer 2

Step-by-step explanation:

x=4

Step-by-step explanation:

look this identity is pretty simple:

SO,

= (x-4) (x+5)

= x(x +5) - 4(x+5)

= x^{2} +5x -4x-20x

2

+5x−4x−20

= x^{2}x

2

+x-20

hence the answer we will get after solving the quadratic equation will be (x-4) (x+5)

ALSO

x-4 = 0 OR x+5=0

x=4 x=-5

BUT,

x cant equal to -5

HENCE THE ANSWER IS x=4

x=4

give this answer brainest