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a) 5√49 - √121=
b) √4/25 + 3 - √1/9=
c) √2 x ( 3 + √2)=
d) 2 √5 x (1-3 √5)=
e) 6√2 - 2 √2 - 5 √2 =
f) √45 + 2 √20 =
a) 5√49 - √121=
b) √4/25 + 3 - √1/9=
c) √2 x ( 3 + √2)=
d) 2 √5 x (1-3 √5)=
e) 6√2 - 2 √2 - 5 √2 =
f) √45 + 2 √20 =
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Verified answer
a)5√49 - √121
= 5.7 - 11
= 35 - 11
= 24
*******************************
b)
= √4/25 + 3 - √1/9=
2 + 3 - 1
----- -----
5 3
3.2 + 15.3 - 5.1 = 6 + 45 - 5 = 6 + 40 = 46
----------------------- ---------------- ---------- ------
15 15 15 15
= 46/15
**************************************
c)
= √2 x ( 3 + √2)
= 3√2 + √2.√2
= 3√2 + 2
***************************
d)
= 2√5 x (1 - 3√5)
= 2√5.1 - 3√5.2√5
= 2√5 - 3.2.√5.√5
= 2√5 - 6.5
= 2√5 - 30
ou
= 2.(√5 - 15)
******************************
e)
= 6√2 - 2 √2 - 5 √2
= 4√2 - 5√2
= - 1√2
****************************
f)
= √45 + 2 √20
= √9.√5 + 2.√4.√5
= 3√5 + 2.2√5
= 3√5 + 4√5
= 7√5