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who to solve this equation? with what solutions :(

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1 Answer

This is the zero product property. Either x-3 = 0 or x2 +4x -21 = 0. So solve each of the two equations, factoring the second term. 
 
x-3 = 0
x = 3
 
x2 +4x -21 = 0
x2 - 3x + 7x -21 = 0
x(x - 3) + 7(x-3) = 0
(x-3)(x+7) = 0 
Using the zero product property, x = 3 or x = -7
 

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