Question

what is 4 minus square root 5 whole squared

Answer 1

Answer:

Step-by-step explanation:

( 4 - √5 )^2 ( ∵( a - b )^2 = a^2+b^2 - 2ab)

= ( 4 )^2 + ( √5 )^2 - 2 × 4 × √5 (∵ root and square 2 ,both are cancelled, we get 5 )

= 16 + 5 - 8 √5

= 21 - 8 √5

Answer 2

Answer:

$(4-\sqrt{5}) ^{2}$

Step-by-step explanation:

Identity ⇒$(a-b)^{2} = a^{2} - 2ab + b^{2$

So, $(4-\sqrt{5}) ^{2}$ = $4^{2} - 2 *4*\sqrt{5} + (\sqrt{5}) ^{2}$

= 16 - 8$\sqrt{5}$ + 25 = 41 - 8$\sqrt{5}$