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If 4 and 6 are solutions to ax2+bx+c=0, find the sum of the solutions for ax2-bx-c=0.

 Mar 9, 2021
 #1
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Solutions 4 and 6 means that :

(x-6)(x-4)=0

x^2 -10x + 24 =0            a = 1    b = -10     c = 24

 

Sub into second equation

x^2 + 10x -24 = 0

(x+12)(x-2)   = 0            solutions are x = -12    and + 2      sum = -10

 Mar 9, 2021

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