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Popular >

21x^2+4x>= 1

Solution

21 x^{2} + 4 x \geq 1

Solution

x \leq - \frac{1}{3} or x \geq \frac{1}{7}

+2

Interval Notation

(- \infty, - \frac{1}{3}] \cup [\frac{1}{7}, \infty)

Decimal Notation

x \leq - 0.33333 \dots or x \geq 0.14285 \dots

Solution steps

21 x^{2} + 4 x \geq 1

Rewrite in standard form

21 x^{2} + 4 x - 1 \geq 0

Factor

21 x^{2} + 4 x - 1 : (7 x - 1) (3 x + 1)

(7 x - 1) (3 x + 1) \geq 0

Identify the intervals

x \leq - \frac{1}{3} or x \geq \frac{1}{7}

Popular Examples

log_{10}(0.001)=x

lo g_{10} (0.001) = x

8 x - 2 = 46

5 x^{2} = 400

simplify (2i-1)^3 simplify

(2 i - 1)^{3}

simplify 2/(-1)simplify

\frac{2}{- 1}

Frequently Asked Questions (FAQ)

What is 21x^2+4x>= 1 ?
The solution to 21x^2+4x>= 1 is x<=-1/3 \lor x>= 1/7