rationalise the denominator 4/2+√5
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Answer:
-2(4-2√5)
Step-by-step explanation:
4 by 2 + root 5
= 4 multiply 2 minus root 5 by 2 square minus root 5 square
= 8 - 4 root 5 by4 - 5
= 8 - 4 root 5 by minus one
= -(8 - 4 root 5)
= -[2(4 - 2√5)]
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