Practice problem
Express 1x+x3\frac1x+\frac x3x1+3x as a single fraction.
13\frac1331
x+33x\frac{x+3}{3x}3xx+3
x+1x+3\frac{x+1}{x+3}x+3x+1
x2+33x\frac{x^2+3}{3x}3xx2+3
Type a concept, like “slope” or “photosynthesis”.
