Posted by Margret on Friday, April 15, 2011 at 10:07am.
(x+2)(x+4) = 30 + x
first we expand the left side of the equation,, multiplying them,
x^2 + 2x + 4x + 8 = 30 + x
then we combine similar terms and make the right side of equation equal to zero (since it's quadratic equation) :
x^2 + 6x + 8 - 30 - x = 0
x^2 + 5x - 22 = 0
now, since it's not factorable, we use quadratic formula
x = [-b +- sqrt(b^2 - 4ac)]/(2a)
note: +- is plus or minus
x = [-5 +- sqrt(5^2 - 4(1)(-22))]/(2*1)
x = [-5 +- sqrt(25 +88)]/2
x = [-5 +- sqrt(113)]/2
separating this into plus and minus:
x = [-5 + sqrt(113)]/2 ; and
x = [-5 - sqrt(113)]/2
hope this helps~ :)
algerbra 1 - 2/n=14/n+30 can some one help me?
Math Pre Algerbra - Need help with Algerbra question two-thirds of a number e 2/...
9th grade (Algerbra) - Why did Grok jump up and down the first time he saw a ...
algerbra - the problem was misunderstood 1/4 = 3- (2x-1 divided by x+2)
Algerbra - HELP!!!!!!! I have to find a rule for the following in and out. Input...
math algerbra 1 - how do you solve for the function in a problem like 4x+y=-10?
Algerbra 2 - Simplify and show the steps to the problem 4(14x-10y) - 6( y + 4x)
Algerbra Fixed - A teacher did this problem with us in class but I dontn get it ...
Algerbra - 5 to the 2nd power-2(5)(4)+-4to the secondpower = I got 25-40+16=59 ...
math - Write the answer to the problem as an algebraic expression. The product ...
For Further Reading