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Answers by Daniel O.

find the radius and center of the cirles (answer)

First you have to complete the square with both the y and the x. Start by grouping together the x's and y's, and you might as well add 12 to both sides to get: (x2 - 4x) + (y2 - 6y) = 12 Now complete the square, by dividing the -4 in front of the x by 2, and divide the...

integration of |x| (answer)

George is correct. It's a relatively simple integral, you just break it up into two parts (you can use the same method for the integral of any absolute value functions). You integrate separately for x<0 and x>0: https://www.google.com/search?q=abs(x)&aq=f&oq=abs(x)&aqs=chrome...

Log3(27x)^2 (answer)

Using some log laws: log3(27x)2 = 2(log3(27x)) = 2(log327 + log3x) = 2(log333 + log3x) = ...

How old is Samuel? (answer)

22 appears correct. If you let his age be S, then divide by the only even prime (2) and add four, it's equal to the LCM of of 5 and 3 (15), so: S/2 + 4 = 15

6papers of which 2 are mathematical how can it be arranged (answer)

For (i), we can treat the 2 papers as being one item (but they can be arranged in 2 ways), and we have to arrange 5 items. Let's call the math papers A and B so they can be arranged as A,B or B,A, and call the others C, D, E, F. So it can look like this for example: (A, B) C, D, E, F,  ...

parabola equation from vertex and focus (answer)

Try using this form: (x - h)2=4p(y - k) Vertex is (h, k) Your vertex is (1, 5), so h = 1 and k = 5   Focus is (h, k+p). Your focus is (1, -9) which means k + p = -9. We know k = 5, so 5 + p = -9, which means p = -14.   Now...

Whats X + 3 > 2 ? (answer)

With inequalities, you mostly treat them the same as an equality, except when multiplying or dividing both sides by a negative number (that changes the direction of the inequality sign). In this case, treat x + 3 > 2 the same way you'd treat x + 3 = 2. We want to get...

solve (x+3)(x+6)=4 (answer)

First try FOILing the two sets of parentheses: (x+3)(x+6)-4=0 x2 + 3x + 6x + 18 - 4 = 0 x2 + 9x + 14 = 0 Now do you know how to factor this? Look for two numbers that multiply to equal 14, and add up to 9, then you can put the factors into the parentheses: (x...

slope 2 goes through (1, -4) (answer)

point-slope form is: y = mx + b We're given the slope, m = 2, so: y = 2x + b We're also given it goes through (1, -4) and those are x and y, since points are given as (x, y).  Replace the y and x in: y = 2x + b with -4 and 1: -4 = 2(1) + b subtract...

2x5/3 +64=0 (answer)

This problem may have been written incorrectly, as it only has complex number solutions (not part of algebra 1). The exact (complex) solutions are: x = 8(-1)3/5 x = -8(-1)2/5   Note: if you change the plus sign in 2x5/3 + 64=0 to a minus sign:  2x5/3 - 64=0 then...

How do i integrate 4x^2/(x^3-8) from 0 to 8 (answer)

You can tell it diverges even before doing the integral, because at x = 2, the denominator of 4x2/(x3 - 8) is zero. There's a vertical asymptote at x = 2 (and that makes it difficult to find the area under the curve!). Remember that that's the point of integration - to find the area under...

1/x + 1/x^2 (answer)

You can also cross multiply the fractions (which is unfortunately awkward to show in this answer box): 1/x + 1/x2 = (x2 + x)/(x*x2) then pull a factor of x from the numerator x(x + 1)/x3 = (x + 1)/x2

What point on the graph of y=x^2-2x+1 is closest to the point (1,2)? (answer)

Is this problem from a calculus class? Because I think that may be the only way to solve it, and it's a kinda long solution (and I left out a few things)... unless you just graph it and try to estimate. It's a minimization problem. You need to use the distance formula  D = d2 = (x2...