Solve for x
70°
*
20
triangles

x = 90°

Step-by-step explanation:

a triangles angles are equal to 180°

so if we have one that is 70° and one that is 20° what s x?

70° + 20° = 90°

180° - 90° = 90°

x = 90°

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form