(a+b)²=289 ; (a-b)²= 121 so a²-b² =?
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Step-by-step explanation:
a²-b²=(a+b) (a-b)
Given in the question
(a+b)²=289
a+b=root 289
a+b=17
(a-b)²=121
a-b=root 121
a-b=11
a²-b²=(a+b) (a-b)
a²-b²=17 × 11
a²-b²=187
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