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HELP QUICK DUE TODAYFrom a square cardboard sheet, a 3 cm wide strip was cut away. The area of the r...
5 months ago
Q:
HELP QUICK DUE TODAYFrom a square cardboard sheet, a 3 cm wide strip was cut away. The area of the remaining rectangular cardboard sheet is 70 cm². Find the original dimensions of the square cardboard sheet.
Accepted Solution
A:
area = S^2
S(S-3) =70
S^2 -3S = 70
S^2 - 3s-70 = 0
(s-10) (s+7) = 0
s = 10, s=-7
S=10
original dimension was 10cm x 10cm