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a. the sign is interchange

it should be = x^2 - 3x + 4 - x^3 - 7x + 2

see explanation

Step-by-step explanation:

(a)

The student has distributed the second parenthesis by 1 instead of - 1

(b)

Given

(x² - 3x + 4) - (x³ + 7x - 2)

distribute the first parenthesis by 1 and the second by - 1, that is

= x² - 3x + 4 - x³ - 7x + 2 ← collect like terms

= - x³ + x² - 10x + 6

answer: '

the distance between points l and m

step-by-step explanation:

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step-by-step explanation: