यदि x + y = 10 और xy = 21 हो, तो x² + y² = ?
उत्तर: (D) 58 — (x+y)² = x² + 2xy + y² → x² + y² = (x+y)² - 2xy = 100 - 42 = 58.
संबंधित REET प्रश्न
Match algebraic identities: (a+b)²=a²+2ab+b², (a-b)²=a²-2ab+b², a²-b²=(a-b)(a+b), (a-b)³=a³-3a²b+3ab...
AlgebraMathematics
Let x=2+√3, then x-1/x = 2√3
AlgebraMathematics
p(x)=x²+1: p(0)=1, p(1)=2, p(2)=5, p(3)=10. Increasing: p(0)<p(1)<p(2)<p(3)
PolynomialsMathematics
Match quadratic: Sum of roots=-b/a, Product=c/a, Equal roots D=0, Unequal roots D≠0
Quadratic EquationsMathematics
"The committee ___ divided on the issue." — सही शब्द:
English GrammarEnglish
Algebra के सभी प्रश्न देखें
विषय देखें →