Question

The zeroes of the

polynomial x2+2x-15 are_____________​

Answer 1

Answer:

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Step-by-step explanation:

factorise the polynomial x2 +2x−15=0 as shown below:

x2 +2x−15=0

x2 +5x−3x−15=0

x(x+5)−3(x+5)=0

x−3=0 or x+5=0

x=3 or x=−5

Hence the zeroes of the polynomial x2 +2x−15 are 3,−5.

Answer 2

Answer:

${x}^{2} + 2x - 15 \\ \\ = {x}^{2} + 5x - 3x - 15 \\ \\ = x(x + 5) - 3(x + 5) \\ \\ = (x - 3)(x + 5)$

THE ZEROES ARE EITHER:

x-3=0=>x=3 or x+5=0=>x=-5