Question

plz help me to solve q 17

Answer 1

the answer is 3.
when a=1;
${x }^{2} + 2x + 1 \\ {x }^{2} + x + x + 1 \\ x(x + 1) + 1(x + 1) \\ (x + 1)(x + 1) \\ x = - 1$
in both the cases