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If a student uses (a-b)^2 to calculate the square of a number, then the number is _______

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in Mathematics – Class 8 by (91.0k points)
If a student uses (a-b)^2 to calculate the square of a number, then the number is _______

(a) 121

(b) 112

(c) 199

(d) 201

I had been asked this question in final exam.

This interesting question is from Finding the Square of a Number in portion Squares and Square Roots of Mathematics – Class 8

1 Answer

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Best answer
Right option is (c) 199

Explanation: A student uses this variant of the formula for the numbers which are near 0. Here there is only one number which is close to 0 and hence 199 is the correct answer. The other options also can be solved using this method but that would be complicated.

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