Evaluate the algebraic expression x^2 - 20 for x = 7 and for x = 9
1 answer:
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I am sorry for my bad hand writing
This is the solution of the equation, where a=1, b=-5, c=7
So the discriminant is :
b^2-4ac=25-4*7= -3
The square root of -3 is non-real, this both solutions are non-real.