What is (3.9-4)/(3.9^2-3(3.9)-4) ?

The solution to (3.9-4)/(3.9^2-3(3.9)-4) is 0.20408…

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simplify (3.9-4)/(3.9^2-3(3.9)-4)

simplify

\frac{3.9 - 4}{3. 9 ^{2} - 3 ( 3.9 ) - 4}

0.20408 \dots

Solution steps

\frac{3.9 - 4}{3. 9 ^{2} - 3 ( 3.9 ) - 4}

Remove parentheses:

(a) = a

= \frac{3.9 - 4}{3. 9 ^{2} - 3 \cdot 3.9 - 4}

Subtract the numbers:

3.9 - 4 = - 0.1

= \frac{- 0.1}{3. 9 ^{2} - 3 \cdot 3.9 - 4}

3. 9^{2} - 3 \cdot 3.9 - 4 = - 0.49

= \frac{- 0.1}{- 0.49}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

= \frac{0.1}{0.49}

Divide the numbers:

\frac{0.1}{0.49} = 0.20408 \dots

= 0.20408 \dots

\frac{7}{9} \cdot \frac{4}{5}

25 x^{2} + 25

2 a - (2 a - 3 b) - b

(5 m - 3)^{2}

- 2 (7 x + 1) - 5 (3 x^{2} + 3 x + 2)

What is (3.9-4)/(3.9^2-3(3.9)-4) ?
The solution to (3.9-4)/(3.9^2-3(3.9)-4) is 0.20408…