Question

x^2 - 4x -21 = 0 (Solve by completing the square)

Answer 1

Answer:

it can only be solved by splitting the middle term

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

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

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

hence the value of x can be 7 if the question is of measurement

or can be -3

or if we have to factorise then it is factorised

Answer 2

Step-by-step explanation:

See The Attachment

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