Practise the method.Example 1Evaluate 7x+4 when x=9.Show worked answerAnswer: 67Substitute x=9.7×9+4=67.Example 2Evaluate 6(x+0) when x=2.Show worked answerAnswer: 12Substitute xevaluate the bracket: 6×(2+0)=6×2=12.Example 3Evaluate x2−3 when x=−8.Show worked answerAnswer: 61Square the substituted value first.(−8)2−3=64−3=61.