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From cracking cryptograms to calculating the top speed of a rocket, algebra gives you tools to apply mathematical reasoning to a wide range of problems. Dive in and see what you already know! See more

Evaluate

\[ \large \frac{ \color{green}{2015} \times \color{blue}{1999} -\color{green}{2015} \times \color{red}{1379}} { \color{blue}{1999} - \color{red}{1379} } . \]

Hint: Use the distributive property.

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If \( a = 2 , b = 7, c = 9 \), what is the value of

\[ 1 + a + b + c + ab + bc + ca + abc ? \]

Hint:

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Evaluate

\[ \Large \color{red}{87} ^ 2 - \color{orange}{86} ^ 2. \]

Hint: Use the difference of two squares identity.

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\[ \large \frac {\color{red}6! \times \color{blue}7!}{\color{purple}{10}!} = \ \color{green}? \]

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Evaluate

\[ \large \frac{ \color{blue}{42} ^ 2 - \color{green}{38} ^ 2 } { \color{blue}{42} - \color{green}{38} }. \]

Hint: Use the difference of two squares identity.

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