Question

I dont understand this, please give an explanation

Answer 1

Answer:

$\bold\blue{x {}^{2} + 5x + 4}$

Here ,

we just need to substitute " x = - 5 " in the equation above.

$\bold{x {}^{2} + 5x + 4} \\\bold{ ( - 5) {}^{2} + 5( - 5) + 4} \\ \bold{ \cancel{25} - \cancel{25} + 4} \\ \fbox\pink{⇢ 4}$

hope helpful ~

Answer 2

$\huge \qquad \boxed{ \sf Aᥒsᥕᥱr ☂}$

let's plug in the value of x as -5, in the given expression ~

$\qquad\rightarrowtail \sf {x}^{2} + 5x - 4$

$\qquad\rightarrowtail \sf { (- 5)}^{2} + 5( - 5) - 4$

$\qquad\rightarrowtail \sf 25 - 25 + 4$

$\qquad\rightarrowtail \sf 4$

Therefore, we got the required value 4