1) Simplify: 2 sqrt 5 + 2 sqrt 5
2) Simplify: -3 sqrt 2 + 2 sqrt 2
3) Simplify: 2 sqrt 7 + 3 sqrt 7 + sqrt 7
4) Solve the equation: sqrt x = 9
2007-08-06 04:31:41 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
1) 4 sqrt 5
2) - sqrt 2
3) 6 sqrt 7
4) x = 81
The first three are done with the distributive property. For example:
2 sqrt(5) + 2 sqrt(5) =
(2 + 2)sqrt(5) =
4 sqrt(5)
2 sqrt 7 + 3 sqrt 7 + sqrt 7 =
(2 + 3 + 1) sqrt(7) =
6 sqrt(7)
The fourth problem is solved by squaring both sides:
sqrt(x) = 9
sqrt(x)^2 = 9^2
x = 81
2007-08-06 04:33:52 · answer #1 · answered by McFate 7 · 1⤊ 0⤋
4 root 5
- root 2
6 root 7
81
2007-08-06 04:36:43 · answer #2 · answered by Mike S 3 · 0⤊ 0⤋
1)4sqrt5
2) -1sqrt2
3)6sqrt7
4)81
2007-08-06 04:34:52 · answer #3 · answered by shubham_nath 3 · 0⤊ 0⤋