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Mathematics for IGCSE & O level - Surds (Section 1 - No. 13)

Find the value of x if x = 5 + √5 and x^2 is equal to:
30 + 10√5
30 - 10√5
25 + 5√5
50

Explicaţie

x^2 = (5 + √5)^2 = 25 + 10√5 + 5 = 30 + 10√5

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