exam Maths Puzzle Numerical Ability

The length of a rectangle is 5 cm less than twice its width. The perimeter of the rectangle in 26 cm. What are the dimensions of the rectangle?

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exam Other Question

solve for X by completing the square
x2-8x+15
y-15=1(x2-8x)
(1/2)(-8) = -4
-4 to the 2nd power = 16
y-15= 1(x2 -8x +16 -16)
x2-8x+16
(x-4)squared
x = 4 I understand what to do when the signs are the same in this problem but what do I do if they differ? 89.3+(-14.4)