what number compared to 21 is the same as 35 compared to 7
2x^2-7x-5=0
1470 = 0.1 × 4200 × (T-310) solve for T
\sqrt{2y^2-5y}-\sqrt{21-6y}=0
2×-3y×4y
2×-3
54/x +63/x+6 = 3
f(x-2)= x^3 then f(x) =
0.01x^2+1.2x-212.5=0
solve 2xsqaured-9x=0 by factorization
$$\begin{bmatrix} 1 & 3 & -2 \\\\ 1 & 0 & 2 \end{bmatrix}$$
