Question

21x=196-x2 by factorisation method​

Answer 1

Answer:

21x=196-x2

x²+21x-196 = 0

x²+(28-7)x-196 = 0

x²+28x-7x-196 = 0

x(x+28)-7(x+28) = 0

(x+28) (x-7) = 0

Either (x+28) = 0. OR. (x-7) = 0

i.e. x = -28. OR. x = 7

so, x = -28 or 7

Step-by-step explanation:

hope it helps you

have a nice day ahead ✌✌

Answer 2

Step-by-step explanation:

ans

given

21x= 196- 2x

21x = 194x

= x + x = 2x

2x = 194-21 = 173

therefore

x= 173/2

x= 86.5

plz mark me as brilliant