Question

(ii) Determine whether the values given against the quadratic equation are the
roots of the equation or not.
x² + 4x 5=0. x=1, - 1.
​

Answer 1

put the value of x = 1

${x}^{2} + \: 4x \\ {1}^{2} + 4 \times 1 \\ 1 + 4 \\ = 5 \\ it \: is \: the \: root \: of \: equation \\ again \: putting \: - 1 \: value \\ { - 1}^{2} + 4 \times ( - 1) \\ 1 - 4 \\ = - 3 \\ it \: is \: not \: the \: root \: o \: equation \\ plz \: mark \: me \: as \: brianliests$