Substituting a = 1, b = 10 and c = -5 into the original formula, we get
Primitive formula
= √( 10? +4× 1×5)
= √ 12 1
= 1 1
(2)
Substitute a =2, b =-8 and c = 5 into the original formula, and you get
Primitive formula
= √((-8)? -4×2×5)
= √24
= 2√6
Second,
The area of squares and circles is π cm.
The side length of a square is √ π√ 3. 14 √ 1.77 (cm).
Third,
Open cubic power with side length of 4 ≈ 1.6(m)
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