What is expand (-4x-5)(-x^2-x+4) ?

The solution to expand (-4x-5)(-x^2-x+4) is 4x^3+9x^2-11x-20

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expand (-4x-5)(-x^2-x+4)

expand

(- 4 x - 5) (- x^{2} - x + 4)

4 x^{3} + 9 x^{2} - 11 x - 20

Solution steps

(- 4 x - 5) (- x^{2} - x + 4)

Distribute parentheses

= - 4 x (- x^{2}) - 4 x (- x) - 4 x \cdot 4 - 5 (- x^{2}) - 5 (- x) - 5 \cdot 4

Simplify

- 4 x (- x^{2}) - 4 x (- x) - 4 x \cdot 4 - 5 (- x^{2}) - 5 (- x) - 5 \cdot 4 : 4 x^{3} + 9 x^{2} - 11 x - 20

= 4 x^{3} + 9 x^{2} - 11 x - 20

(2 a + 3 d) (2 a - 3 d)

(5 + 3 i) - (2 + 9 i)

- 2 x^{2} + 22 x - 56

6 + 2 7 + 38

\frac{3}{4} \times \frac{3}{5}

What is expand (-4x-5)(-x^2-x+4) ?
The solution to expand (-4x-5)(-x^2-x+4) is 4x^3+9x^2-11x-20