4 minus root 5 whole square
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(4 - √5)²
= (4)² - 2(4)(√5) + (√5)²
= 16 - 8√5 + 5
= 21 - 8√5 (√5 = 2.236)
= 21 - 8(2.236)
= 21 - 17.888
= 3.112 __________________(Ans.)
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