To write the quadratic equation based on the given statement, we start by translating it into mathematical expressions:
- "the product of negative six and a number squared" translates to \(-6x^2\).
- "the product of five and the same number" translates to \(5x\).
- "is thirty-one" translates to \(= 31\).
Putting this all together, we have:
\[ -6x^2 + 5x = 31 \]
Thus, the equivalent quadratic equation is:
\(-6x^2 + 5x = 31\)
So the correct response is:
−6x2+5x=31 (negative 6 x squared plus 5 x is equal to 31).