Question

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

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Answer 1

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

therefore , a - b = 5 -2 = 3

and when b = 5 , a = 2

a- b = 2-5 = -3

               

Answer 2

Answer:

here is your answer

a+b=7

ab=10

a-b=?

u know that

a+b whole 2 =a-b whole 2+4ab