If root of a+b=4+2root5, then a+b=?
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R(a+b) = 4+2r(5)
squaring on both sides
a+b = (4+2r(5))²
= 16+4×5+2×4×2r(5)
= 36+16 r(5)
squaring on both sides
a+b = (4+2r(5))²
= 16+4×5+2×4×2r(5)
= 36+16 r(5)
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