Question
Simplify the expression $x + 7 + 4 (x – 5)$ and find the value if $x$ is equal to $2.$
✓
Answer
$= x + 7 + 4 (x – 5)$
$= x + 7 + 4x – 20$
$= x + 4x + 7 – 20 [$rearranging terms$]$
$= 5x – 13$
$= 5(2) – 13$
$= 10 – 13$
$= –3$
$= x + 7 + 4x – 20$
$= x + 4x + 7 – 20 [$rearranging terms$]$
$= 5x – 13$
$= 5(2) – 13$
$= 10 – 13$
$= –3$
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→(i) $-4 ^* 3$
(ii) $(-3) ^*(-2)$
(iii) $(-7)$ # $(-3)$
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Next, match these answers with suitable letters by looking at the table below and arrange them in increasing order of integers to decode the name of the Mathematician.
| Integers | -9 | 14 | -3 | 4 | -10 | 8 | -33 | -21 | 7 | 18 |
| Letters | P | Y | C | T | U | I | E | G | L | D |