x = 7+ root 40 then find x cube
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i am trying to answer it
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Step-by-step explanation:
x=7+√40
x=7+2√10
=(√5)²+(√2)²+2×√2×√5
=(√5+√2)²
√x=√5+√2
1/√x=1/√5+√2
=√5-√2/3
√x+1/√x=√5+√2 + √5-√2/3
=4√5+2√2/3
ie 2/3( 2√5+√2)
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