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Answer :
Hello !
4x² - 100 = 0
We have a² - b² = (a + b)(a - b)
so 4x² - 100 = 0
⇔ (2x)² - 10² = 0
⇔ (2x + 10)(2x - 10) = 0
2x + 10 = 0 or 2x - 10 = 0
2x = - 10 or 2x = 10
x = -10/2 or x = 10/2
x = -5 or x = 5
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