A quadratic equation has roots 3 and 4. What is the quadratic equation in standard form?
Answer: A. x² - 7x + 12 = 0
If the roots are r1 and r2, the quadratic equation can be expressed as x² - (r1 + r2)x + (r1 * r2) = 0. Here, (3 + 4) = 7 and (3 * 4) = 12, so the equation is x² - 7x + 12 = 0.