20 cm x 15 cm = 300 cm2
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Yes, the square root of 225 is ± 15 because 15 x 15 = 225 AND -15 x -15 = 225
The perimeter of this square measures 4 x 1 = 4 decimeters. As 1 decimeter = 10 centimeters then 4 decimeters = 4 x 10 = 40 centimeters.
A is a perfect square trinomial, so first you factor it:A = (x-15)(x-15)This is a square with one side being (x-15).So the perimeter must be (x-15)+(x-15)+(x-15)+(x-15) because a square has four sides.So P = 4x-60
If you mean that the sum of the two numbers is 20 and the product is 75, then X+Y=20 and XY=75 solving for Y and substituting: Y=20-X and XY=X(20-X) then X(20-X)=75 and 20X-X2=75 (20X-X2)-(20X-X2)=75-(20X-X2) then X2-20X+75=0 factoring (X-5)(X-15)=0, so X=15 or X=5 if X=5, then Y=75/X=15 if X=15, then Y=75/X=75/15=5