Evaluate
\frac{7x^{2}+11x+2}{\left(x+1\right)\left(x+2\right)}
Expand
\frac{7x^{2}+11x+2}{\left(x+1\right)\left(x+2\right)}
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\frac{\left(3x+1\right)\left(x+2\right)}{\left(x+1\right)\left(x+2\right)}+\frac{4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x+1 and x+2 is \left(x+1\right)\left(x+2\right). Multiply \frac{3x+1}{x+1} times \frac{x+2}{x+2}. Multiply \frac{4x}{x+2} times \frac{x+1}{x+1}.
\frac{\left(3x+1\right)\left(x+2\right)+4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)}
Since \frac{\left(3x+1\right)\left(x+2\right)}{\left(x+1\right)\left(x+2\right)} and \frac{4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)} have the same denominator, add them by adding their numerators.
\frac{3x^{2}+6x+x+2+4x^{2}+4x}{\left(x+1\right)\left(x+2\right)}
Do the multiplications in \left(3x+1\right)\left(x+2\right)+4x\left(x+1\right).
\frac{7x^{2}+11x+2}{\left(x+1\right)\left(x+2\right)}
Combine like terms in 3x^{2}+6x+x+2+4x^{2}+4x.
\frac{7x^{2}+11x+2}{x^{2}+3x+2}
Expand \left(x+1\right)\left(x+2\right).
\frac{\left(3x+1\right)\left(x+2\right)}{\left(x+1\right)\left(x+2\right)}+\frac{4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of x+1 and x+2 is \left(x+1\right)\left(x+2\right). Multiply \frac{3x+1}{x+1} times \frac{x+2}{x+2}. Multiply \frac{4x}{x+2} times \frac{x+1}{x+1}.
\frac{\left(3x+1\right)\left(x+2\right)+4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)}
Since \frac{\left(3x+1\right)\left(x+2\right)}{\left(x+1\right)\left(x+2\right)} and \frac{4x\left(x+1\right)}{\left(x+1\right)\left(x+2\right)} have the same denominator, add them by adding their numerators.
\frac{3x^{2}+6x+x+2+4x^{2}+4x}{\left(x+1\right)\left(x+2\right)}
Do the multiplications in \left(3x+1\right)\left(x+2\right)+4x\left(x+1\right).
\frac{7x^{2}+11x+2}{\left(x+1\right)\left(x+2\right)}
Combine like terms in 3x^{2}+6x+x+2+4x^{2}+4x.
\frac{7x^{2}+11x+2}{x^{2}+3x+2}
Expand \left(x+1\right)\left(x+2\right).
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}