MATHEMATICS · Single correct · CBSE · Mathematics · Algebra Play · Algebra Play
Problem
Priya wants to verify whether x=−2 satisfies 5x+3=−7. She writes:
5(−2)+3=−10+3=−13=−7. Hence, x=−2 is a solution.
Which statement correctly explains the error in her verification?
(a) She multiplied 5 and −2 incorrectly; she thought 5×(−2)=−8.
(b) She assumed that −13 and −7 are equal just because both numbers are negative.
(c) She added −10 and 3 incorrectly; it should be −7, not −13.
(d) She compared the left-hand side with the right-hand side before finishing the simplification of the left-hand side.