solve and check both answers please?

0 ⤊

solve and check both answers please?

1. sqrt x-1 =x-3

2. sqrt 5x+5 -15=0

2007-12-21 09:16:20 · 3 answers · asked by God Bless America!~ 4 in Education & Reference ➔ Homework Help

3 answers

sqrt x-1=x-3
square the whole problem

x-1=x^2-6x+9
x-1+1=x^2-6x+9+1
x= x^2-6x+10
x-x=x^2-7x+10
x^2-7x+10=0

(x-2)(x-5)=0
x=2 or x=5

sqrt 5x+5-15=0

square the problem
5x+5+225=0
5x+230=0
5x=-230
x=-46

2007-12-21 11:04:45 · answer #1 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋

sqrt(x) -1 or sqrt(x-1) ?

2007-12-21 17:22:51 · answer #2 · answered by ? 3 · 0⤊ 0⤋

yes, for both problems please put in parenthesis to show which part the sqrt applies to.

2007-12-21 17:24:11 · answer #3 · answered by zgsweb 3 · 0⤊ 0⤋