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X² - 91 = 53 X² = 53 + 91 X² = 144 X = ±√(144) X = ±12 X = 12, x = - 12 x² + 18 = 187 X² = 187 - 18 X² = 169 X = ±√(169) X = ± 13 X = 13, x = - 13 x² - 56 = 169 X² = 169 + 56 X² = 225 X = ±√(225) X = ±15 X = 15, x = - 15.

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Cipriano2
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X² - 91 = 53

X² = 53 + 91

X² = 144

X = ±√(144)

X = ±12

X = 12, x = - 12

x² + 18 = 187

X² = 187 - 18

X² = 169

X = ±√(169)

X = ± 13

X = 13, x = - 13

x² - 56 = 169

X² = 169 + 56

X² = 225

X = ±√(225)

X = ±15

X = 15, x = - 15.