5. If a + b = 7 and ab = 10; find a - b.
Answers
Answered by
3
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
Answered by
0
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
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