Question

Determine whether the value x=1 is root of
$x ^{2} + 4x - 5 = 0$
​

Answer 1

Answer:

let x=1

$p(x) = p(1) \\ p(1) = 1 {}^{2} + 4(1) - 5 = 0 \\ 1 + 4 - 5 = 0 - \\ 5 - 5 = 0 \\ =0 = 0$

Therefore, x=1 is a root of given equation