Question

The range of $f(x)=3x^2+7x+10$ is

• A. $\left[\frac{70}{3},\infty \right)$
• B. $\left[\frac{71}{12},\infty \right)$
• C. $[0,\infty )$
• D. $\left(-\infty .\frac{70}{3}\right)$

Answer 1

Answer: (B)

Range of $a{x}^2+bx+c(a>0)$ is $\left[\frac{4ac-b^2}{4a},\infty \right)$