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Write down the quadratic equation whose roots are x = -7 and x = 1, and the coefficient of x^2 is 1. 

Wondering how you got the positive 7 and negative 1

(x + 7) ( x - 1) = 0

 

x^2 + 7x - 1x  - 7   = 0

 

x^2 + 6x - 7  = 0

 Dec 15, 2018
 #1
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Note that   if

 

(x + 7) (x - 1)  = 0

 

Then  either  x + 7  = 0     which implies that x =   -7  makes this true...so this is a root

 

OR

 

x - 1  = 0     which implies that  x =  1  makes this true.......so this is also a root

 

 

cool cool cool

 Dec 15, 2018

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