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If q(x) = 2x³ + x² − 3x, what is the value of q(−1)?यदि q(x) = 2x³ + x² − 3x है, तो q(−1) का मान क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 22
Substituting x = −1 gives q(−1) = 2(−1)³ + (−1)² − 3(−1) = −2 + 1 + 3 = 2. Therefore, option B is correct. Exam tip: always use parentheses when substituting a negative number to avoid sign errors, especially in terms such as −3(−1).x = −1 रखने पर q(−1) = 2(−1)³ + (−1)² − 3(−1) = −2 + 1 + 3 = 2। इसलिए सही उत्तर B है। ऋणात्मक संख्या का मान रखने से पहले उसे कोष्ठक में लिखें; इससे −3(−1) जैसे पदों में चिह्न की गलती नहीं होती।
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