Square

The square's side length decreases by 25%. Now it has an area of 28 cm2 lower. Find the side of the original square.

Correct answer:

a =  8 cm

Step-by-step explanation:

a2((125/100)a)2=28  0.4375a228=0  p=0.4375;q=0;r=28 D=q24pr=0240.4375(28)=49 D>0  a1,2=2pq±D=0.875±49 a1,2=0.875±7 a1,2=±8 a1=8 a2=8 a=a1=8=8 cm

Our quadratic equation calculator calculates it.




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