Question

Use the zero product property to find the solutions to the equation x2 â€"" 15x â€"" 100 = 0. X = â€""20 or x = 5 x = â€""20 or x = â€""5 x = â€""5 or x = 20 x = 5 or x = 20.

Answer 1

The values for $x$ are -5 and 20

Given to us:

$x^2-15x-100=0$

In order to use the zero product property, we need to find out a 2 numbers whose product is -100 and sum is -15.

for that you can take the LCM of 100 and check all factors of 100.

for example,

factors of 100 are 100, 50, 25, 20, 10, 5, 4, 2, 1.

from this -20 and +5 are the numbers whose sum will give -15 and product will be -100. therefore,

$x^2-15x-100=0\\x^2-20x+5x-100=0$

taking out common terms, we get

$(x^2-20x)+(5x-100)=0\\x(x-20)+5(x-20)=0\\(x+5)(x-20)=0$

to find out the value of $x$ equating both the factors with 0, we get

$(x+5)=0\\x=-5\\(x-20)=0\\x=20$

Hence, the values for $x$ are -5 and 20

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