Factorise fully 2x2 – 8x

Guests at an amusement park must be at least 54 inches tall to be able to ride the roller coaster. which graph represents the set of heights that satisfy this requirement?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle