Multiply and then simplify the radical expressions:
(1) sqrt(7a) x sqrt13
(2) sqrt(5a) x sqrt(15a)
(3) sqrt3(sqrt5 - sqrt3)
(4) (sqrt2 + 3)(sqrt2 - 7)
2006-11-12 10:30:33 · 2 answers · asked by Big Daddy 2 in Science & Mathematics ➔ Mathematics
1. sqrt 91a
2. asqrt75
3. sqrt15 - 3
4.-4sqrt2-19
2006-11-12 10:36:50 · answer #1 · answered by MollyMAM 6 · 0⤊ 0⤋
(1) sqrt 91a
(2) sqrt75a^ which equals sqrt 25*3*a^ which equals
5asqrt3 (The first person's answer is correct, but you should break the 75 down further to 25 and 3, because 25 is a perfect square and can be simpified along with the a^ .
(3)sqrt15 - 3
(4) Multiply each term of the first polynomial to each term of the second to get:
2 -7sqrt2 + 3sqrt2 - 21
Then combime like terms to simplify
2 -4sqrt2 -21 which equals
-19 - 4sqrt2
2006-11-12 11:03:20 · answer #2 · answered by Empress Sky 2 · 0⤊ 0⤋