x^2+x=12 solve using quadriatic formula

Question

I know the answer is 3,-4 could you please show me how to work it all out. thank you Please use quadratic formula

Answer 1

x^2+x=12 solve using quadratic formula.  I know the answer is 3,-4 could you please show me how to work it all out. thank you Please use quadratic formula

 

First, put the equation in standard form:

 

x² + x = 12

 

x² + x - 12 = 0                   [Standard form]

 

Next, you need to look in your notes or text book and find the quadratic formula - but I'll give it to you here.  This is something you should commit to memory:

 

-(b/2a) ± [b²-4ac]^1/2/2a

 

This is for a general quadratic equation: ax² + bx + c = 0

 

In your problem, a=1, b=1, and c=-12.  Plug those values into the quadratic formula to get the answers.  The plus or minus sign (±) means there are two answers, one for the plus and another for the minus.