Kari uses substitution to decide whether x2+x is equivalent to x(2x+1). She says the expressions are equivalent because they have the same value when x=0. Is Kari correct? Explain.

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22-04-2015
Mathematics

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Kari uses substitution to decide whether x2+x is equivalent to x(2x+1). She says the expressions are equivalent because they have the same value when x=0. Is Kari correct? Explain.

Sagot :

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RedRicin RedRicin · Answer 1 · 2015-04-22T21:45:34-04:00

RedRicin RedRicin

22-04-2015

Kari is not correct. Plug in any value other than 0 for these and the answers you get will not be equal, simple as that. (ex. If x =3, x² + x = 12 and x(2x+1) = 21)

x = 0 would be a solution to the set of equations, but the question here is are all solutions valid, which is not so.

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