Question

5. If a + b = 7 and ab = 10; find a - b.​

Answer 1

Answer:

Step-by-step explanation:

(a+b)² = a²+b²+2ab

(7)² = a²+b²+2(10)

a²+b² = 49-20 = 29

(a-b)² = a²+b²-2ab

= 29-2(10) = 9

a-b = √9

a-b = ±9

Answer 2

Answer:

Step-by-step explanation:

HI FRIEND ✋✋

a + b = 7

a= 7 - b

ab = 10

(7-b)b = 10

7b - b² = 10

b² - 7b + 10 = 0

b² - 5b - 2b + 10 = 0

b( b - 5 ) - 2(b-5) = 0

b = 2 , b = 5

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when b = 2 , a = 5

therefore , a - b = 5 -2 = 3

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and when b = 5 , a = 2

a- b = 2-5 = -3

hope it helps