X^2-13x+q=0 x=12.5 q-?

Question

X^2-13x+q=0
x=12.5
q-?

Answer 1

X^2-13x+q=0
x=12.5
q-?
(12.5)^2-13×12.5+q=0
156,25-162,5+q=0
q=6,25

Comments

Можете еще один задачу решить

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x^2-12x+q=0

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x=2 q-? x2-?

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позже(

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2^2-12×2+q=0 ; 4-24+q=0 ; q=20; x^2=2^2=4

Answer 2

12,5*12,5 - 13*12,5 = -q;
156.25 - 162.5 = -q;
-6.25 = -q; q = 6.25