Question

(X)×(x+1)×(x+2)×(x+3)=840​

Answer 1

X(1+2+3)=840

X+2x+3x=840

6x=840

x=840/6

x=140

Answer 2

Step-by-step explanation:

$(x) \times (x + 1) \times (x + 2) \times (x + 3) = 840 \\ {x}^{4} + 6 = 840 \\ {x}^{4} = 84 0 - 6 \\ {x}^{4} = 832 \\ x = \sqrt[4]{832} \\ x = by \: solving \: l.c.m \:$