Question

solve this (x+7) (x+9) = (x+3) (x+21)

Answer 1

(x+7) (x+9) = (x+3) (x+21)

Solution

x^2+9x+7x+63=x^2+21x+3x+63

x^2+16x+63=X^2+24x+63

2x^2+16x-24x+63-63=0

63 has been cancelled out!!

2x^2-8x=0

x^2-8x=0 ----> B)

x(x-8)=0

x=0

x=8

or

Using equation B

X^2=8X

X=8

x=8 showing that it is not a correct answer because while putting x=8 in main equation is not equating equation to each other means showing unbalance equation. so it is concluded that x=0 is the correct answer!!!!!!

Answer 2

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