Question

15.
(i) If a + b = 7 and ab = 10, find the value of (a - b).​

Answer 1

Step-by-step explanation:

• a + b = 7
• ab = 10

We know that

• (a - b)² = (a + b)² - 4ab
• (a - b)² = (7)² - 4×10
• (a - b)² = 49 - 40
• (a - b)² = 9
• (a - b) = 3

Answer 2

Step-by-step explanation:

.•a+b=7

•ab=10

therefore:

(a-b)