{"id":21280,"date":"2026-05-25T22:28:07","date_gmt":"2026-05-25T16:28:07","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/perform-an-introductory-matrix-operation-3\/"},"modified":"2026-05-25T22:28:07","modified_gmt":"2026-05-25T16:28:07","slug":"perform-an-introductory-matrix-operation-3","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/perform-an-introductory-matrix-operation-3\/","title":{"rendered":"Perform an introductory matrix operation"},"content":{"rendered":"<p>Multiply the matrix [[-4, 6], [7, 1]] by 3.<\/p>\n<ul class=\"quiz-options\">\n<li>[[-1, 9], [10, 4]]<\/li>\n<li>[[-12, 18], [21, 3]]<\/li>\n<li>[[-4, 18], [21, 1]]<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2889,2721],"subject":[2750],"education_level":[1894],"class_list":["post-21280","mcq","type-mcq","status-publish","hentry","topic-advanced-algebra","topic-matrices","subject-advanced-mathematics","education_level-grade-8"],"mcq_note":"Scalar multiplication means multiply every entry by 3. Do not multiply only one row or one column. A scalar multiplies each entry of the matrix separately. The position of each entry stays the same; only its value changes. Matrix operations require attention to position, so avoid mixing entries from different rows or columns. The correct answer is [[-12, 18], [21, 3]], which matches the calculation or reasoning shown.","mcq_options":[{"right":"no","answer":"[[-1, 9], [10, 4]]"},{"right":"yes","answer":"[[-12, 18], [21, 3]]"},{"right":"no","answer":"[[-4, 18], [21, 1]]"}],"multi_answers":"no","subject_terms":[{"id":2750,"title":"Advanced Mathematics","slug":"advanced-mathematics"}],"topic_terms":[{"id":2889,"title":"Advanced Algebra","slug":"advanced-algebra"},{"id":2721,"title":"Matrices","slug":"matrices"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/21280","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq"}],"about":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/types\/mcq"}],"author":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/comments?post=21280"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=21280"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=21280"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=21280"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=21280"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}