English Deutsch Français Italiano Español Português 繁體中文 Bahasa Indonesia Tiếng Việt ภาษาไทย
All categories

Solve by completing the square.

1. x(squared)-6x=7

2. x(squared)+14x-9=6

2007-05-02 15:40:17 · 3 answers · asked by TracyM 1 in Science & Mathematics Mathematics

3 answers

(x-7)(x+1)
x = 7, -1

(x +15)(x-1)
x= -15, 1

2007-05-02 15:42:27 · answer #1 · answered by cat n 3 · 0 0

Please use the carat (^) to indicate a power. ending up a sq.: x^2- 6x = 7 Now if I had x^2 -6x + 9, i could have a perfect sq. (x-3)^2. by using including 9 to the two aspects of the eqtn, I even have this style; Then (x-3)^2 = 7+9 = sixteen Taking the sq. root (x-3) = +/- 4 So x=7 and -a million x^2 + 14 x - 9 = 6 or x^2 +14 x = 15. comparable deal. x^2+14x+40 9 is an ideal sq., so I even have upload 40 9 to the two aspects to get (x+7)^2 = sixty 4 Take the sq. root and x+7 = +/- 8 Then x= -15 or a million

2016-10-14 10:02:32 · answer #2 · answered by Anonymous · 0 0

(x-3)^2-16=0
x-2 = +-4
x=6 and x= -2

2)((x+7)^2-64=0
x= -7+-8
x=-15 and x= 1

2007-05-02 15:52:15 · answer #3 · answered by santmann2002 7 · 0 0

fedest.com, questions and answers