Question

If the area of the rectangle shown is given by the expression 3x2 + 72 - 6and the width is (a + 3), which of the

following would represent the length? Remember: A = lw (Hint: Box method multiplication may be helpful here!)

Answer 1

3x - 2.

Explanation:

The length = area / width.

The area 3x^2 + 7x - 6 = (3x - 2 )(x + 3)

so the length = (3x - 2 )(x + 3 ) / x + 3

= 3x - 2.