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What are the solutions for the quadratic equation x2 minus 8x equals 9?
Wiki User
∙ 13y ago
To solve a quadratic equation (which means to find the zeros of that equation) you have two options
1. type the equation into a graphing calculator and graph the resulting equation and find where the x intercepts are (where y=0)
2. solve the quadratic equation by factoring
First, set the equation equal to zero.
x2-8x-9=0
Then find the resulting x values by "smiling"
multiply the first term and the last term (x2) (9)
find two numbers that add to -8 and multiply to -9
these two numbers are -9 and 1
x2- 9x 1x-9
x(x-9) 1(x-9)
the resulting factors are 0= (x+1)(x-9)
to find the roots, set these factors = 0
x+1=0
x=-1
x-9=0
x=9
Therefore, the solutions for the quadratic equation are x=-1 and x=9
Wiki User
∙ 13y ago
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