Rectangle's 47643

The rectangle has an area of ​​147 cm2. One of its sides is three times longer than the other side. We increase the shorter side of the rectangle by 8 cm. By how many cm2 will the new rectangle's area be larger than ​​the original rectangle?

Correct answer:

x =  168 cm2

Step-by-step explanation:

S=147 cm2 a=3b S=ab=3b2  b=S/3=147/3=7 cm a=3 b=3 7=21  S1=a (b+8)=21 (7+8)=315 cm2  x=S1S=315147=168 cm2

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