alleryStart learning →How many real numbers have a square equal to 49?
AOne
BFour
CTwo
DNone
Answer & Solution
Correct answer: C. Two
Both 7 and -7 square to 49, so every positive real is the square of exactly two numbers.
Keep practising Basic Algebraic Identities and Elementary Surds
Browse all Basic Algebraic Identities and Elementary Surds questions for SSC CGL, or explore more Quantitative Aptitude topics.
Related questions
The number zero is the square of how many real numbers?A square of a real number x is less than x exactly when x lies in which range?What is the product of sqrt2 and sqrt8?Which of the following numbers is irrational?The order of the surd fifth root of 7 is what?Which of these is a surd?Which is greater: sqrt3 or the cube root of 5?Which of these three numbers is the largest: sqrt2, cube root of 3, fourth root of 5?