Taken from an exercise:
The graph of $y = ax^3 + bx^2 + cx + d$ touches the x-axis at $x = -2$. The graph also cuts the y-axis at $y = 5$ with a gradient of 3. Find $a$, $b$, $c$ and $d$.
I've been able to find $c$ and $d$ but not $a$ or $b$.
Taken from an exercise:
The graph of $y = ax^3 + bx^2 + cx + d$ touches the x-axis at $x = -2$. The graph also cuts the y-axis at $y = 5$ with a gradient of 3. Find $a$, $b$, $c$ and $d$.
I've been able to find $c$ and $d$ but not $a$ or $b$.