{"id":17738,"date":"2026-05-02T19:18:03","date_gmt":"2026-05-02T13:18:03","guid":{"rendered":"https:\/\/mcqacademy.com\/en\/mcq\/root-expression-from-sum-and-product-20-99\/"},"modified":"2026-05-02T19:18:03","modified_gmt":"2026-05-02T13:18:03","slug":"root-expression-from-sum-and-product-20-99","status":"publish","type":"mcq","link":"https:\/\/mcqacademy.com\/en\/mcq\/root-expression-from-sum-and-product-20-99\/","title":{"rendered":"Root Expression From Sum And Product 20 99"},"content":{"rendered":"<p>If \u03b1 and \u03b2 are roots of x^2 &#8211; (20)x + (99) = 0, find \u03b1^2 + \u03b2^2.<\/p>\n\n<ul class=\"quiz-options wp-block-list\">\n<li>598<\/li>\n<li>9761<\/li>\n<li>223<\/li>\n<li>202<\/li>\n<\/ul>\n","protected":false},"author":39,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","topic":[2705],"subject":[1425],"education_level":[1896],"class_list":["post-17738","mcq","type-mcq","status-publish","hentry","topic-algebra","subject-mathematics","education_level-hsc"],"mcq_note":"Use Vieta's formulas instead of solving the quadratic. For x^2 - (20)x + (99) = 0, the roots \u03b1 and \u03b2 satisfy \u03b1 + \u03b2 = 20 and \u03b1\u03b2 = 99. The expression we need is \u03b1^2 + \u03b2^2. Use the identity \u03b1^2 + \u03b2^2 = (\u03b1 + \u03b2)^2 - 2\u03b1\u03b2. So \u03b1^2 + \u03b2^2 = (20)^2 - 2(99) = 400 - (198) = 202. This is why the correct answer is 202.","mcq_options":[{"right":"no","answer":"598"},{"right":"no","answer":"9761"},{"right":"no","answer":"223"},{"right":"yes","answer":"202"}],"multi_answers":"no","subject_terms":[{"id":1425,"title":"Mathematics","slug":"mathematics"}],"topic_terms":[{"id":2705,"title":"Algebra","slug":"algebra"}],"_links":{"self":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/mcq\/17738","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=17738"}],"wp:attachment":[{"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/media?parent=17738"}],"wp:term":[{"taxonomy":"topic","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/topic?post=17738"},{"taxonomy":"subject","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/subject?post=17738"},{"taxonomy":"education_level","embeddable":true,"href":"https:\/\/mcqacademy.com\/en\/wp-json\/wp\/v2\/education_level?post=17738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}