Onlie quiz 3

The sum of a number and its square is 72. Find the number.

• -8 or 9

• 8 or 9

• 8 or -9
• -8 or -9

One number is twice another number. If the number is represented by x, what is the other number?

• x/2
• 2x
• x-2
• x+2

• 2
• 1
• 3
• 0

Which of the following is the quadratic formula?

• (x + 4)(x + 5) = 0
• (x - 4)(x + 5) = 0

• (x - 4)(x - 5) = 0
• (x + 4)(x - 5) = 0

• {-5, -4}
• {5, 4}

• {-5, 4}

• {5, -4}

• both negative

• both positive

• positive and negative

• one solution is zero.

• subtract 4 from both sides

• subtract 5 from both sides

• multiply both sides by x

• extract the square roots

Which of the following represents the solution of a quadratic inequality?

• Two points

• All negative integers

• All positive integers including 0

• A set of values within the interval

If the area of a square is at least 100 sq.m., what is the least possible value the side can have?

• 1 m.

• 4 m.

• 10 m.

• 25 m.