Angelica solves the system { x + y = -3.
x - y =1 } and finds the solution ( 1, 3 ). use substitution to explain whether angelica’s solution is correct.

the correct solution is (-1,-2), angelicas answer is incorrect, comment if something confuses you

- 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

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.