If ∣∣∣2−4x9∣∣∣=58 | 2 − 4 x 9 | = 58 , find the value of x.

Assessment: JAMB UTME - Mathematics - 2019 Subject: General Mathematics

Question 1 Report

If $| \begin{matrix} 2 & - 4 \\ x & 9 \end{matrix} | = 58$ , find the value of x.

Answer Details

$| \begin{matrix} 2 & - 4 \\ x & 9 \end{matrix} | = 58$
$⟹ (2 \times 9) - (- 4 \times x) = 58$
$18 + 4 x = 58 ⟹ 4 x = 58 - 18 = 40$
$x = 10$

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