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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.

asked Mar 7, 2016

Mathematics
middle-school

1 answer

2 votes

190k views

Which country led Europe in sailing innovations in the 15th century

asked Jul 19, 2015

History
high-school

1 answer

3 votes

72.5k views

Why is acceleration negative in a free fall?

asked Mar 23, 2015

Physics
high-school

2 answers

0 votes

155k views

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