Can anyone plz help me?

SAS Postulate

Step-by-step explanation:

In EDG & ADC ,

1) AD = ED ( given )

2)angle( EDG ) = angle ( ADC ) [ Vertical Opposite Angles are equal ]

3) GD = CD ( D is the mid - point of CG )

So triangles EDG & ADC are congruent by SAS postulate

i'm sorry mate, but i am not seeing any figures. i am unable to solve this for you.

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81