mavii

Substitution means putting numbers in place of letters to calculate the value of an expression. The bracket has been worked out first. \(2 + (-8)^2 = 2 + 64\). \(-8^2\) means \(-8 \times -8 ...

Substitution ... formulae works the same way as substitution into expressions, and it is important to follow the rules of BIDMAS. What is the temperature in Fahrenheit if it is 20 °C? Substitute ...