Subject
সমাজসেবা অধিদপ্তর
Topic
অফিস সহায়ক - ৩১.০৮.২০১৮
a+b=8 ও ab=15 হলে a2-b2সমান কত?
a+b=8 ও ab=15 হলে a2-b2সমান কত?
ক)
64খ)
49গ)
16ঘ)
34Explanation
দেওয়া আছে, a + b = 8 ab = 15 ∴ a - b = √{(a + b) 2 - 4ab} = √(8 2 - 4 × 15) = √(64 - 60) = √4 = 2 ∴ a 2 - b 2 = (a + b)(a - b) = 8 × 2 = 16Related questions
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