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Savageboyn
02.03.2021 •
Mathematics
the length of a rectangle is 7 cm more than its width and the area is 30 cm find the length, width and the perimeter
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Ответ:
Step-by-step explanation:
let width=x
length=x+7
x(x+7)=30
x²+7x-30=0
x²+10x-3x-30=0
x(x+10)-3(x+10)=0
(x+10)(x-3)=0
either x=-10 (rejected being negative)
or x=3
width=3 cm
length=3+7=10 cm
Perimeter=2(10+3)=2×13=26 cm
Ответ: