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How do you solve #1 - 4a > 21#?

Answer 1

Eva Adamson

#a< -5#

#"subtract 1 from both sides"#

#cancel(1)cancel(-1)-4a>21-1#

#-4a>20#

#"divide both sides by "-4#

#color(blue)"reversing the sign as a consequence"#

#a< -5" is the solution"#

#a in(-oo,-5)larrcolor(blue)"in interval notation"#

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Answer 2

Ethan Adkins

To solve the inequality 1 - 4a > 21, first, subtract 1 from both sides: -4a > 20. Then, divide both sides by -4, remembering to reverse the inequality sign because you're dividing by a negative number: a < -5. So, the solution is a is less than -5.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

How do you solve #1 - 4a &gt; 21#?

How do you solve #1 - 4a > 21#?