Question

find the zeroes of the quadratic polynomial f(x)=x²+8x+15​

Answer 1

Answer:

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Step by step solution:

$Given \ f(x)=x^{2}+8x+15\\\\we \ have \ to \ solve \ it.\\\\Let \ us \ do\\\\f(x)=x^{2}+8x+15\\\\f(x)=x^{2}+3x+5x+15\\\\f(x)=x(x+3)+(5(x+3)\\\\f(x)=(x+3)(x+1)\\\\x+3=0\\\\x=-3 \ or \ x+1=0\\\\x=-1$

Hope it is clear to you.