Question

1. Determine whether the value given against of the quadratic equation is the root of the equation
x² + 4x - 5 = 0, r= 1​

Answer 1

Answer:

yes 1 is a root of polynomial x² + 4x - 5 = 0

Step-by-step explanation:

we have , x = 1

${x}^{2} + \: 4x \: - 5 \: = 0 \\ {(1)}^{2} + 4 \times 1 - 5 = 0 \\ 1 + 4 - 5 = 0 \\ 5 - 5 = 0 \\ 0 = 0 \\ hence \: 1 \: is \: a \: root \: of \: {x}^{2} + \: 4x \: - 5 \: = 0$