Ifa-b= 7 and ab = 18; find a + b.
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0
Answer:
answer is
= 7b + 18a
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Answer:
a + b = 11 OR -11
Step-by-step explanation:
a - b = 7
a = 7 + b -----{i}
ab = 18 -----{ii}
Substitute {i} in {ii}
(7+b)b = 18
7b + b² = 18
b² + 7b - 18 = 0
b² + 9b - 2b - 18 = 0
= b (b + 9) - 2(b + 9)
= (b - 2) (b + 9)
b = 2 , -9
a - b = 7
Case 1: if b = 2 Case 2: if b = -9
a - 2 = 7 a-(-9) = 7
a = 7 + 2 a + 9 = 7
a = 9 a = 7-9 = -2
a + b
= 2 + 9 OR = -2 - 9
= 11 = -11
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