Question

if f(x)= 2x²-x-5 then f(-2)=_____​

Answer 1

Step-by-step explanation:

given

f(x) = 2x²-x-5

now

f(-2)= 2(-2)²-(-2)-5

= 2(4)+2-5

= 8-3

= 5

Answer 2

$\large\bold{\underline{\underline{Given:-}}}$

$f(x) = 2 {x}^{2} - x - 5$

$\large\bold{\underline{\underline{To\:find:-}}}$

$f( - 2)$

$\large\bold{\underline{\underline{Solution:-}}}$

For $f(-2)$, just plug '$-2$' for all values of $x$.

$f( - 2) = 2( { - 2})^{2} - ( - 2) - 5$

$= 2( - 2 \times - 2) + 2 - 5$

$= 2(4) + 2 - 5$

$= 8 + 2 - 5$

$= 10 - 5$

$=5$

Therefore, $\bigstar \: \boxed{\sf{\color{purple}{f(-2)=5}}}$

$\large\mathfrak{{\pmb{\underline{\red{Tornado77 }}{\red{❦}}}}}$