if a+ b = 7 and ab =10;finda-b
Answers
Answered by
9
Given a + b = 7 and ab = 10
(a + b)² - (a - b)² = 4ab
(7)² - (a - b)² = 4*10
49 - (a - b)² = 40
(a - b)² = 9
a - b = √9 = +3 or -3
a - b = +3 or - 3
(a + b)² - (a - b)² = 4ab
(7)² - (a - b)² = 4*10
49 - (a - b)² = 40
(a - b)² = 9
a - b = √9 = +3 or -3
a - b = +3 or - 3
Answered by
3
(a-b)^2 = (a+b)^2 - 4ab
(a-b)^2 = 7^2 - 4*10
(a-b)^2 = 49-40 = 9
(a-b) = √9 = +3 or -3
(a-b)^2 = 7^2 - 4*10
(a-b)^2 = 49-40 = 9
(a-b) = √9 = +3 or -3
Similar questions