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(√5-√3)² = (√5)²-2√5√3+(√3)²
= 5-2√15+3
= 8-2√15
= (√5 - √3)(√5 - √3)
= (√5)² - √15 - √15 + (√3)²
= √25 - 2√15 + √9
= 5 - 2√15 + 3
= 8 - 2√15
semoga dapat di pahami