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Mathematics & Statistics
Mental arithmetic #1
Mental arithmetic #1
SOON
1/ 3x + 1 = 26
3x + 1 = 26
x = 7
x = 5
x = -2
x = -7
2/ 6x + 1 ≥ 10
6x + 1 ≥ 10
x ≥ −1.5
x ≥ 1.5
x ≤ −1.5
x ≤ 1.5
3/ −6x + 1 ≤ 10
−6x + 1 ≤ 10
x ≥ −1.5
x ≥ 1.5
x ≤ −1.5
x ≤ 1.5
4/ f(x) = "2x" / "x + 3"
f(x) = "2x" / "x + 3"
ℝ\{0}
ℝ\{−3} ⇐
ℝ\{3}
ℝ
5/ x^2 + 2x + 1 = 0
x^2 + 2x + 1 = 0
x = −1 and x = 2
x = −1 only
x = 1 and x = −1
6/ x^2 − x − 6 = 0 are x = 2 and x = 3
x^2 − x − 6 = 0 are x = 2 and x = 3
False
True
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