5. If a + b = 7 and ab = 10; find a - b.
Answers
Answered by
1
answer is 3
Step-by-step explanation:
a=5,b=2
a+b=5+2=7
ab=5*2=10
a-b=5-2=3.
Answered by
0
ab = 10
a = 10/b
Substitute this value in
a + b = 10
10/b + b = 10
10/b + b^2/b = 10
(10 + b^2) / b = 10
10 + b^2 = 10b
b^2 - 10b + 10 = 0
(b - √2)^2 = 0
b = _+ 2
b = -2 OR b = +2
a + b = 7
a = 7 - b
a = 7 - 2
a = 5
a - b = 5 - 2 = 3
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