simplify sqrt(8)*sqrt(7)
Let's simplify: 8×7
ⓘ We look for the largest square dividing 8, 4 = 22, and take it out of the root: 8 = 4×2 = 4×2 = 2×2
2×2×7
ⓘ The product of two square roots is the square root of the product: 2×7 = 2×7
2×2×7
ⅰ 2×7 = 14
▶Simplified form:   2×14
The numeric value of: 2×14 equals:
2×≈ 3.7417
▷ ≈ 7.4833