Calculate the area of the rectangle if its length is 12 cm longer than its width and length is equal to the square of its width.

Correct answer:

S =  64 cm2

Step-by-step explanation:

a = 12 +b a=b2 b+12=b2 b2b12=0  b2b12=0  p=1;q=1;r=12 D=q24pr=1241(12)=49 D>0  b1,2=2pq±D=21±49 b1,2=21±7 b1,2=0.5±3.5 b1=4 b2=3 b=b1=4 a=b2=42=16 S=a b=16 4=64 cm2

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