Simplify 1) root 45 - 3 root 20 + 4 root 5
2) (r + root 3) (3 - root 3)
3) 4 root 28 divide by 3 root 7
saubia:
in no. second is it r or 3?
Oops it's 3 sorry and thank you. :P
Answers
Answered by
17
1)√45-3√20+4√5
=√9×5-3√4×5+4√5
=3√5-6√5+4√5
=-3√5+4√5
=√5
2)(3+√3) (3-√3)
=3²-(√3)²
=9-3
=6
3)4√28/3√7
=4√7×4/3√7
=8√7/3√7
=8/3
=√9×5-3√4×5+4√5
=3√5-6√5+4√5
=-3√5+4√5
=√5
2)(3+√3) (3-√3)
=3²-(√3)²
=9-3
=6
3)4√28/3√7
=4√7×4/3√7
=8√7/3√7
=8/3
Thank you so much!
your most welcome
Answered by
8
1)45^1/2-3*20^1/2+4*5^1/2
=3*5^1/2-6*5^1/2+4*5^1/2
=5^1/2
2)(3+3^1/2)(3-3^1/2)
=3^2-(3^1/2)^2 [(a+b)(a-b)=a^2-b^2]
=9-3 [(a^m)^n=a^m*n]
=6
3)4*(28^1/2)/3*7^1/2
=8*(7^1/2)/3*7^1/2
=8/3
=3*5^1/2-6*5^1/2+4*5^1/2
=5^1/2
2)(3+3^1/2)(3-3^1/2)
=3^2-(3^1/2)^2 [(a+b)(a-b)=a^2-b^2]
=9-3 [(a^m)^n=a^m*n]
=6
3)4*(28^1/2)/3*7^1/2
=8*(7^1/2)/3*7^1/2
=8/3
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