Question

the coefficient of x^2 in the polynomial f(x)=(2x^2+5x+3) (2x^2-5x+3) is ?​

Answer 1

Answer: -13 is the coefficient of x².

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Answer 2

Answer:

$given \\ f(x) = (2 {x}^{2} + 5 x + 3)(2 {x}^{2} - 5x + 3) \\ \: \: \: \: \: \: \: \: \: \: = 4 {x}^{4} - 13 {x}^{2} + 9 \\ therefore \: coefficient \: of \: {x}^{2} in \: f(x) \: is \: \\ - 13.$