Kalkulator pozwoli obliczyć wartość podanego przez Ciebie wyrażenia. We wzorze możesz używać zmiennych. Ich wartości do obliczenia będziesz podawać w formularzu, który pokaże się z prawej strony ekranu. • Jeżeli masz kłopot z wpisaniem wzoru, naciśnij przycisk pomocy, aby zobaczyć przykłady. • Zawsze możesz kliknąć w So this 9x plus 3y equals 15 becomes 9x plus 3 times y. The second equation says y is 5 plus x. So we're going to put 5 plus x there instead of a y. 3 times 5 plus x is equal to 15. And now we can just solve for x. We get 9x plus 3 times 5 is 15 plus 3 times x is 3x is equal to 15. Explanation: let the number be n. then '3 times the number' means the number multiplied by 3. ie 3 × n = 3n. Answer link. 3n >let the number be n then '3 times the number' means the number multiplied by 3 ie 3xx n = 3n. This is a 3 by 3 matrix. And now let's evaluate its determinant. So what we have to remember is a checkerboard pattern when we think of 3 by 3 matrices: positive, negative, positive. So first we're going to take positive 1 times 4. So we could just write plus 4 times 4, the determinant of 4 submatrix. So we could view it as 2 times 6 over 3. 2 times 6 over 3, which is the same thing, of course, as 2, 4, 6, 8, 10, 12, 12/3. And what is 12/3 equal to? Well, we could rewrite 12 as-- so this is equal to-- we could rewrite 12 as 3 plus 3 plus 3 plus 3 over the yellow 3. Let me do it like this so I don't have to keep switching colors. "Squared" is often written as a little 2 like this: This says "4 Squared equals 16" (the little 2 means the number appears twice in multiplying, so 4×4=16). Square Root. A square root goes the other direction:. 3 squared is 9, so a square root of 9 is 3. It is like asking: Let's see, 60 is equal to 2 times 30. 30 is equal to 2 times 15. And then 15 is 3 times 5. So we do have a perfect square here. We do have a 2 times 2 in there. If it was a minus, it's now going to be a plus. Minus or plus 2 times the square root of 15. Or another way to view it is that the two solutions here are 4 minus two roots of 15 OcXv1.

3 plus 3 times 3 plus 3