X^2 -25 =0. Factor and use the zero product property to solve.
2 answers:
X^2 - 25 is a difference of squares which has a special factorization.
In general, a^2 - b^2 = (a + b)(a - b)
x^2 - 25 = 0
(x + 5)(x - 5) = 0
x + 5 = 0 or x - 5 = 0
x = -5 or x = 5
Ax^2 + bx + c = 0
a = 1, b = 0, c = -25
Quadratic formula:
x = {-b +/- sqrt(b^2 - 4ac)} / 2a
x = {0 +/- sqrt(0 - 4(1)(-25))} / 2(1)
x = +/- sqrt(100) / 2
x = +/- 10/2
x = +/- 5
Factored: (x - 5)(x + 5)
Solutions: 5 and -5
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