1. If (a + b)2 = 289 and (a - b)2 = 121, then a? – b2 = ?
(1) 198
(2) 189
(3) 187
(4) 178
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Answered by
5
Step-by-step explanation:
hope it will help you option 3
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Answered by
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Answer:
Step-by-step explanation:
(a+b)^2=289
a+b=17
(a-b)^2= 121
a-b=11
(a+b) + (a-b) =2a
17+11 =28
a=14
a-b=11
14-11=
3=
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