C-05-Q031mediumsingle_mcq

Which of the following is an identity?

a $x + 3 = 5$
b $2x = 6$
c $(a - b)^2 = a^2 - 2ab + b^2$
d $x^2 = 4$

ব্যাখ্যা

An identity is an equality that holds for every value of the variables involved, not just particular ones. Option c is the standard square-of-a-difference expansion, true for all $a$ and $b$ ; the other three are conditional equations satisfied only by specific values.

এই অধ্যায়ের আরও প্রশ্ন

C-05-Q032If the same number is added to both sides of an equation, the two sides—
C-05-Q033If both sides of an equation are multiplied by the same nonzero number, the two sides—
C-05-Q034If , then by transposition—
C-05-Q035If , then by transposition equals—
C-05-Q036The equation with has the solution—
C-05-Q037To clear fractions in we may multiply both sides by—
C-05-Q038Which operation is NOT a valid step while solving an equation?
C-05-Q039Solve :
C-05-Q040Solve :
C-05-Q041Solve :

Equations in One Variable — সব প্রশ্ন দেখুন (170টি) →

Which of the following is an identity?

x + 3 = 5

2x = 6

(a - b)^2 = a^2 - 2ab + b^2

x^2 = 4