Question

find the value of polynomial x2+2x-5 if x=2​

Answer 1

${x}^{2} + 2x - 5 \\ putting \: x = 2 \\ {2}^{2} + 2 \times 2 - 5 \\ = 4 + 4 - 5 \\ = 8 - 5 \\ = 3$