Question

write the coefficient of
${x}^{2}$
in the product of (x-1)(1+2x)​

Answer 1

$\huge\tt\colorbox{skyblue}{Answer}$

$(x - 1)(1 + 2x) \\ x(1 + 2x) - 1(1 + 2x) \\ x + 2 {x}^{2} - 1 - 2x \\ 2 {x}^{2} + x - 2x - 1 \\ 2 {x}^{2} - x - 1 \\ \\ the \: coefficient \: of \: {x}^{2} \: is \: 2$

Answer 2

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