Question

a + b =7
and ab=10
find-
a-b​

Answer 1

Answer:

${(a - b)}^{2} = {(a + b)}^{2} - 4ab$

$= {(a - b)}^{2} = {7}^{2} - (4 \times 10)$

$= {(a - b)}^{2} = 49 - 40$

$= {(a - b)}^{2} = 9$

$= a - b = 3$

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