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whereswoodruff
17.10.2020 •
Mathematics
1.Solve the inequality (x-2)(x+1) ≥ 0 .
2. Find the solution set of the following inequality
3|2 + 1| ≤ 6
3. Solve simultaneously:
a) y = x2
and y = 2x + 3
b) y = 8 – x and xy = 7
Solved
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Ответ:
#1: inequality form: x ≤ –1 or x ≥ 2
interval notion: ( -∞,-1] U [2,∞)
#2: false/no solution
#3: A) point form: (3,9)(-1,1)
equation form: x= 3,y=9 and x= -1,y=1
B)point form: (1,7)(7,1)
equation form: x=1,y=7 and x=7,y=1
Step-by-step explanation:
#1: solve for x by simplifying both sides of the inequality, then isolating the variable.
#2: N/A
#3: solve for the first variable in one of the equations, then substitute the results into the other question.
Ответ:
200
Step-by-step explanation:
500+300=800 1000-800=200