Q. 19 B4.0( 4 Votes )

Solve the followi

Answer :





Cross multiplying,


7× 6 = 6 × (x2 – 4x - 5)


42 = 6x2 – 24x – 30


6x2 – 24x – -30 - 42= 0


6x2 – 24x – 72= 0


6(x2 – 4x – 12) = 0


x2 – 4x – 12 = 0


On factorizing,


x2 – 6x + 2x – 12 = 0


x(x – 6) + 2(x – 6) = 0


(x + 2) (x – 6) = 0


Solving first part,


x + 2 = 0


x = -2


Solving second part,


x – 6 = 0


x = 6


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