Question

Do not use your calculater for this
simplify- i) √20+√80

ii) √28-2√63+√7​

Answer 1

Answer:

1)

$\sqrt{100}$

=10

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Answer 2

Answer:

(i) √80 + √20

√80=√2*√2* √2*√2 *√5

      = √4²*√5

      = 4√5

√20= √2*√2*√5

      = √2²*√5

     = 2√5

√80 + √20 = 4√5 + 2√5

                  = 6√5 (Ans)

(ii) √28 - 2√63 + √7

  √28 = √7  * √4

   √63 = √7 * √9

=  √28 - 2√63 +√7

=  √7√4 - 2√7 √9 + √7

= √7(√4-2√9 + 1)

=√7(2 - 2*3 + 1)

= √7(2-6+1)

=√7(-3)

= -3√7  (Ans...)