Question

plzz help me with the following

Answer 1

Given Equation is x^2 - 4x - 21 = 0

= > x^2 - (7 + 3)x - 21 = 0

= > x^2 - 7x + 3x - 21 = 0

= > x(x - 7) + 3(x - 7) = 0

= > (x + 3)(x - 7) = 0

= > x = -3,7.

Hope this helps!

Answer 2

Hey brain-ly user ur answer is here....

I hope it is make u satisfied.....

Given:-

x^2 - 4x - 21 = 0

x^2 - 7x + 3x - 21= 0

x (x - 7) + 3 (x - 7)= 0

(x - 7)(x + 3)= 0

x - 7 =0

x= 7

x + 3=0

x = -3

{{{{x = 7 , 3}}}}