Answer:
1.) L = x + 3
2.) A = (x + 3)x
3.) Dimensions: 7m x 4m
Step-by-step explanation:
Given:
Area of pool (A) = 28sq.m.
1.) if x = width (W)
Length (L) = x + 3
2.)
A = LW
A = (x + 3)x
3..)
28 = (x + 3) x
28 = x² + 3x
x² + 3x - 28 = 0
by factoring:
(x + 7)(x - 4) = 0
x + 7 = 0
x = -7
x - 4 = 0
x = 4
say x = 4, W = 4
L = x + 3
L = (4) + 3
L = 7
check:
A = LW
28 = (7)(4)
28 = 28, ok
