202+25酉ส : 4x2-20x +25 = (2x)2-20x + 52= (2x-5)2= (2x-5) (2x-5)璽 – InterviewSolution

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202+25酉ส : 4x2-20x +25 = (2x)2-20x + 52= (2x-5)2= (2x-5) (2x-5)璽-a2-b2 = (a + b) (α-b)= (x+3)(x-3)X2-9=0→(x+3)(x-3)= 0

Answer»

x² - 9

(x - 3)( x + 3)

To x = 3 or - 3

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