AOLeng Learning

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a^2 + b^2 = c^2\\[10px] \begin{aligned} c &= \sqrt{a^2 + b^2}\\[10px] &= \sqrt{3^2 + 4^2}\\[10px] &= \sqrt{25}\\[10px] &= \boxed{5} \end{aligned}

Relates the sides of a right triangle: the square of the hypotenuse.

\begin{gathered} 5 \underbrace{\hspace{30px}\vphantom{10px}}_{+2} 7 \underbrace{\hspace{30px}\vphantom{10px}}_{+3} 10 \underbrace{\hspace{30px}\vphantom{10px}}_{+4} 14 \underbrace{\hspace{30px}\vphantom{10px}}_{+5} 19 \underbrace{\hspace{30px}\vphantom{10px}}_{+6} ? \\[1cm] \text{Then the answer is } 19+6=25. \\[2cm] 5 \underbrace{}_{+2} 7 \underbrace{\hspace{30px}\vphantom{10px}}_{+3} 10 \underbrace{\hspace{30px}\vphantom{10px}}_{+4} 14 \underbrace{\hspace{30px}\vphantom{10px}}_{+5} 19 \underbrace{\hspace{30px}\vphantom{10px}}_{+6} ? \\[1cm] \text{Then the answer is } 19+6=25. \end{gathered}

Extra space added between numbers (hspace) and the brace below (vphantom).