Question

Linda evaluates the expression 7+5x for x=3 and x+4/5. When x=3, she gets 7+5x=7+5 times 3 =12 times 3 =36. When x=4/5, she gets 7+5x=7+5 times 4/5=12 times 4/5=48/5. What does linda do wrong?Explain

Answer 1

the first expression

`7+5x`

x=3

`7+5(3)=7+15=22`

she was wrong because she first sum 7+5 and she doesn't respect that first we always solve the brackets and then the other operations

and for x=4/5

`7+5((4)/(5))=7+4=11`

the same mistake she doesn't respect that first we always solve the operations with brackets and then the other operations