4x+5=21

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x ^(2) + 4x - 21 =?

In the equation 4x=21 , LHS =

For all x > 21, ((x^(2) + 8x + 7)(x - 3))/((x^(2) + 4x - 21)(x + 1)) = ?

the solution set of x^2-4x - 21 ge 0 is

Solve 2|x - 5|+ 5 = 21

x-4=21

Find the solution set of each of the following inequations : 10lt4x-5lt21,x inN

(x^2-4x-21)=?