Question

(x-3) (2x+1)=x(x+5)in quadratic equation

Answer 1

(x-3)(2x+1) = x(x+5)

2x²+x-6x-3 = x² + 5x

x²-5x-3 = 5x

x² - 10x - 3

here is your answer

Answer 2

X(2x+1)-3(2x+1)
2x square +x-6x+1
2x square - 5x+1

It is quadratic equation