Question

The width w of a rectangular swimming pool is 7x^2. The area A of the pool is 7x^3 – 42x^2. What is an expression for the length of the pool?

Answer 1

start with A = length x width so in your question

\[7x^3 -42x^2 = 7x^2 \times length\]

by changing the subject it becomes

\[\frac{7x^2}{7x^2} - \frac{42x^2}{7x^2} = length\]

simplify the fractions for the length of the pool

Answer 2

So what did you get?

Answer 3

I haven't done it... I've just given you the process to do it

Answer 4

Oh can you do it?

Answer 5

Please???

Answer 6

well I'd look at the problem like this

\[\frac{7x^2 \times x}{7x^2} - \frac{6 \times 7x^2}{7x^2} = length\]

just simplify for the length, hope you can see the common factor

Answer 7

so it would be....?

Answer 8

??????????

Answer 9

well have an attempt at simplifying the fractions...its reasonably obvious