-6
x2 23x equals 0
Since there are only terms in x2 and constants, but none in x, completing the square is not an option! x2 - 14 = 7 x2 = 21 and so x2 = sqrt(21)
25
To square a number (mathematically expressed as X2) you multiply it by itself. 49 is the square of the number 7, and 7 can be said to be the 'square root' of 49.
-6
Adding 100 completes the square. { I wonder why you want to complete the square when the expression already factors as x(x-20) }.
Since the first coefficient is already equal to 1, just take half the second coefficient (half of 14), then square the result. This must be the constant term on the left side.
x2 23x equals 0
Since there are only terms in x2 and constants, but none in x, completing the square is not an option! x2 - 14 = 7 x2 = 21 and so x2 = sqrt(21)
x3=x2 x3-x2=0 Factor out x2 x2(x - 1) = 0 If x2=0 then x=0. If x - 1 = 0 then x = 1. Therefore the number is 0 or 1.
x2 - 11 = 70 x2 = 81 x = sqrt(81) x = ±9
25
To square a number (mathematically expressed as X2) you multiply it by itself. 49 is the square of the number 7, and 7 can be said to be the 'square root' of 49.
23 - x2 = sqrt(36) 23 - x2 = ±6 x2 = 17 or 29 So x Î {-5.385, -4.123, 4.123, 5.385} approx
x2 + x + 1/4 x2 + 2x + 1 x2 + 4x + 4 In each case, the number on the right is one-half the number in the middle, squared.
The square of a number is the result obtained by multiplying the number by itself. The operation is known as squaring the number. The name comes from the fact that the area of a square is the square of one its sides. An expression such as x2 is usually read as x-square,