Algebra

posted by .

I used an online math site, to explain quadratic equations. But the thing is, they said that (-4)^2 is 16, but my calculator said -16. Why is that? And also, how does the square root of 40 break down into the square root of 4 and the square root of ten? Does this have to do with GCF's?

  • Algebra -

    Your calculator is wrong.
    Enter 4, then press the "change of sign" button (if you have one) to get -4 in the display, and then hit x^2.

    If you still get -16, get a better calculator , or call them for tech help. I hope you saved your receipt.

    sqrt 40 = sqrt (4*10) = 2 sqrt 10

    This has nothing to do with GCF's

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. college math

    I'm hoping I did thesse right. Solve each quadratic equation. (I don't know how to do symbols on here so i'll write it out in word form) The equation is: x squared + 3x+4=0 I said its not possible because i got x=3 + or - the square …
  2. Math

    What is 20 to the 1/2 power? How do you figure it out?
  3. Algebra

    Use the quadratic formula to solve the equation. Give exact answers: 2x^2 -1 = 6x. The choices are: a) -3 + square root(7)/2, -3 - square root(7)/2 b) 3 + square root(11)/2, 3 - square root(11)/2 c) 3 + square root(7)/2, 3 - square …
  4. Algebra

    69: 16x^2+8x-3. I inserted this into the quadratic formula and got -8+/- the square root of (8^2-4(16)(-3)/(2 times 16). This reduced to -8+/- the square root of (64+120)/32, which further reduced to -8+/-the square root of 184/32. …
  5. Algebra

    When you're breaking down the square root in the quadratic formula into several parts- say it was the originally the square root of 80 so you break it down to square root of 4 and square root of 20-would the results be added or multiplyed?
  6. Algebra

    Can you explain how to find the solution of 3x^2-2x+5, using the quadratic formula?
  7. Year 11 maths

    My teacher said If x-2(square root xy)=9-4(square root 2) so since there are two square roots -2(square root xy) equals -4(square root 2) How is this possible, could the values be different and they are not equal.
  8. Math

    When trying to solve arctan(sqrt 567.2 / -459.6) my answer was -2.96. My teacher said that i handled the radical wrong. She said I have to square both numbers, then add them, and then find the square root. I am confused because you …
  9. Algebra

    Rationalize each expression by building perfect nth root factors for each denominator. Assume all variables represent positive quantities. I don’t understand how to compute these. Also I don’t have the square root sign so I typed …
  10. Algebra 1

    1. (3.0 X 10^2) x (2.0 X 10^6) I said 6 X 10^8 2. what is the area of a square with the dimension of 1+ ã 2?

More Similar Questions