If the roots of a quadratic equation are 4 and 5 then which equation is correct?

A. x² - 9x + 20 = 0 / x² - 9x + 20 = 0

Step 1: If roots are α and β then equation is x² - (sum)x + product = 0. Step 2: Sum is 9 and product is 20 so x² - 9x + 20 = 0. Step 3: Write signs carefully while forming an equation from roots.

Step 1: Roots α और β हों तो equation x² - (sum)x + product = 0 होती है। Step 2: sum 9 और product 20 है इसलिए x² - 9x + 20 = 0। Step 3: Roots से equation बनाते समय signs ध्यान से लिखें।