Correct answer: quadratic equation
Explanation:
An equation of the form \( p(x) = 0 \), where \( p(x) \) is a polynomial of degree 2, is called a quadratic equation.
The general form of a quadratic equation is:
\[ ax^2 + bx + c = 0,\quad \text{where } a \ne 0 \]
Linear equations are of degree 1, not 2. So, the other options are incorrect.
Let \( M \) be a \( 7 \times 7 \) matrix with entries in \( \mathbb{R} \) and having the characteristic polynomial \[ c_M(x) = (x - 1)^\alpha (x - 2)^\beta (x - 3)^2, \] where \( \alpha>\beta \). Let \( {rank}(M - I_7) = {rank}(M - 2I_7) = {rank}(M - 3I_7) = 5 \), where \( I_7 \) is the \( 7 \times 7 \) identity matrix.
If \( m_M(x) \) is the minimal polynomial of \( M \), then \( m_M(5) \) is equal to __________ (in integer).