Question

-(4-√5)^2 simplify

Answer 1

Answer:

-21 + 8√5

Step-by-step explanation:

=> -(4-√5)^2

using identity (a-b)^2 = a^2 + b^2 -2ab

=> -{4^2 + (√5)^2 - 2(4)(√5) }

=> -(16 + 5 - 8√5 )

=> -(21 - 8√5 )

=> -21 + 8√5

Answer 2

Answer:

$\huge{\boxed{\boxed{\sf{-3.18}}}}$

Step-by-step explanation:

$\huge{\boxed{\boxed{\underline{\sf{SOLUTION-}}}}}$

$= ) - (4 - \sqrt{5} )^{2} \\ = )( x - y)^{2} = {x}^{2} + {y}^{2} - 2xy \\ = ) - ( {4}^{2} + \sqrt{5}^{2} - 2 \times 4 \times \sqrt{5} ) \\ = ) - ( 16 + 5 - 8 \sqrt{5} ) \\ = ) - (21 - 8 \sqrt{5} ) \\ = )- 21 + 8 \sqrt{5} \\ = )- 21 + 8 \times 2.23 \\ = ) - 21 + 17.84 \\ = ) - 3.18$

$\huge{\boxed{\boxed{\sf{-3.18}}}}$

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