ABC26GN0759 · Decimal Fractions

Subject: General Aptitude · Chapter: Decimal Fractions · Exam: 2008 · Marks: · Difficulty:

$(78.95)^{2}-(43.35)^{2}=$ ?

(a)4148

(b)4235.78

(c)4305

(d)4353.88

(e)None of these

Answer

Answer (as printed): D

Explanation

$(78.95)^2 - (43.35)^2 = (78.95+43.35)(78.95-43.35) = 122.3 \times 35.6 = 4353.88$. [∵ $a^2-b^2=(a+b)(a-b)$]

Explanation as extracted from the printed page; notation may be imperfect.