a rectangular parking area has an area of 135m². If its length is 12m more than thrice its width,
a.how wide is the parking area?
b.how about the length?
pa help plss with solution
a.how wide is the parking area?
b.how about the length?
pa help plss with solution
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Answer:
a. 5 m
b. 27 m
Step-by-step explanation:
A = lw
A = 135m²
l = 12 + 3w
a.) 135 = (12 + 3w)w
135 = 12w + 3w²
45 = 4w + w²
w² + 4w = 45
w² + 4w +4 = 45 + 4
(w + 2)² = 49
√(w +2)² = √49
w + 2 = ± 7
w = 5 w = -9
Take the positive root, w = 5
b.) l = 12 + 3w
l = 12 + 3(5)
l = 27