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x2 + 4x - 45 = zero

(x - 5 ) ( x + 9 ) = zero

x - 5 = zero .... or .... x + 9 = zero

X = 5 .... or .... X = -9

Note : I understand from your question that X's means X2 ,,, if not please re-write your question by using discussion bottom.

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