What are the solutions to the equation 3(x – 4)(x + 5) = 0?
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3(x -5)(x+5) = 0
(X-5)(x+5) = x^2 - 5^2
Because (a-b)(a+b) = a^2-b^2
= 3(x^2-5^2) = 0
= 3x^2-75 =0
=3x^2 = 75
=X^2 = 75/3
=x^2 = 25
= x = root 25
=x = 5
I think so we can solve this in quadratic equation method but i recommend this method if you are writting in your notes
(X-5)(x+5) = x^2 - 5^2
Because (a-b)(a+b) = a^2-b^2
= 3(x^2-5^2) = 0
= 3x^2-75 =0
=3x^2 = 75
=X^2 = 75/3
=x^2 = 25
= x = root 25
=x = 5
I think so we can solve this in quadratic equation method but i recommend this method if you are writting in your notes
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