SOLUTION: I need help on factorising quadratic expressions: It says to factorise fully - {{{ 2(x+3)^2-10 }}} The textbook answer is {{{ 2(x+3+sqrt(5))(x+3-sqrt(5)) }}} However I got a

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: I need help on factorising quadratic expressions: It says to factorise fully - {{{ 2(x+3)^2-10 }}} The textbook answer is {{{ 2(x+3+sqrt(5))(x+3-sqrt(5)) }}} However I got a      Log On


   

Question 978023: I need help on factorising quadratic expressions:
It says to factorise fully - +2%28x%2B3%29%5E2-10+
The textbook answer is +2%28x%2B3%2Bsqrt%285%29%29%28x%2B3-sqrt%285%29%29+
However I got an answer of +2%28x%2B3%2Bsqrt%2810%29%29%28x%2B3-sqrt%2810%29%29+
I used difference of two squares.
Thankyou
Found 2 solutions by Alan3354, jim_thompson5910:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
You didn't divide the -10 by 2.

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
+2%28x%2B3%29%5E2+=+%28sqrt%282%29%28x%2B3%29%29%5E2+
+10+=+%28sqrt%2810%29%29%5E2+
-------------------------------------------------------
+2%28x%2B3%29%5E2-10+=+%28sqrt%282%29%28x%2B3%29%29%5E2+-+%28sqrt%2810%29%29%5E2+





+2%28x%2B3%29%5E2-10+=+2%28%28x%2B3%29+-+sqrt%285%29%29%28%28x%2B3%29+%2B+sqrt%285%29%29+

Hopefully that helps. If not, then let me know.