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SAAT (English)

Mathematics: sample 5

These questions are ETEC/Qiyas's own officially published trial-exam questions, shown here with attribution. They are not sold and are not part of Smart Advanced Network for Education, Development & Achievement's original question bank.
Directions

Read the following questions. Choose the right answer.

There is only ONE correct answer to each question.

Let A = [[−2, x], [3, 6]]. The value of x that makes A noninvertible is:

  1. 3
  2. 1
  3. −4
  4. −9
Show answer

Correct answer: C. −4

Why

A matrix is noninvertible when its determinant is zero: (−2)(6) − (x)(3) = 0 → −12 − 3x = 0 → x = −4.

Source: The Standardized Academic Achievement Test (SAAT) for the Science Track Trial Test (ETEC official) Open the official document

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