4
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16. 4 multiplied by itself equals 16.
-2
it is the square root of 16 which equals 4.
Square root of 6.25 equals ± 2.5
quadratics have the form ax2+bx+c=0 the discriminant is the square root of (b2-4ac) = square root of (16-16) =square root of 0 = 0