Question

Find which of the following equations are quadratic:

5x² – 8x = –3(7 – 2x)

Answer 1

5x² – 8x = –3(7 – 2x)

`\implies` 5x² – 8x = 6x – 21

`\implies` 5x² – 14x + 21 = 0; which is of the form ax² + bx + c = 0.

∴ Given equation is a quadratic equation.