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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